Is Intermediate Accounting, Volume 2, 4th Edition -- Kin Lo, George Fischer -- 2, 4, 2020 -- Pearson Education Canada -- isbn13 9780134730370 -- f8dd32e05341aa7c3ad6d5ef45fe95fb -- Anna’s Archive.pdf safe?
No antivirus engine identified malware, and the completed sandbox run found no offensive behavior, though two direct-IP contacts lack reputation verification.
The PDF received no detections from 76 antivirus engines, including 18 tier-1 engines, and one sandbox run produced no malicious verdict or offensive technique. Its direct-IP connections remain a caution because no complete host-reputation cross-check is available, but they lack corroborating detections or malicious child activity.
286930f0bea43ff4b7…90c80265a52b5cRecommended next actions
Before opening
Open it only when its sender or download source is one you independently trust.
If you already opened it
Keep normal device protection enabled and stop if the file behaves unexpectedly.
Intelligence
The saved assessment, checked against the scan evidence and recorded coverage.
The reasoning behind this verdict
This section explains the evidence supporting the verdict and keeps conflicting or missing signals visible.
The PDF received no detections from 76 antivirus engines, including 18 tier-1 engines, and one sandbox run produced no malicious verdict or offensive technique. Its direct-IP connections remain a caution because no complete host-reputation cross-check is available, but they lack corroborating detections or malicious child activity.
Static scanning produced 0 detections among 76 antivirus engines, with all 18 participating tier-1 engines reporting no detection. One completed sandbox run recorded only ambient techniques T1036 and T1082, with no offensive techniques, persistence, or malicious sandbox verdict. Ten child artifacts were inspected without a malicious child finding, although their individual verdicts remain unknown. The principal counter-signal is direct-IP traffic to 104.80.224.135 and 18.213.11.84, and no complete host-reputation result is available. With no YARAify, CIRCL, or MalwareBazaar corroboration, the direct-IP heuristic is insufficient to outweigh the broader evidence.
What We Detected
The PDF was not flagged by any of 76 antivirus engines. All 18 participating tier-1 engines, including Avast, BitDefender, ESET-NOD32, Kaspersky, Microsoft, and Fortinet, reported no detection. Research intelligence also returned no matching YARA rules or known-malware records.
Threat Behavior
One completed sandbox run observed Adobe Reader processes and ambient techniques T1036 and T1082, but no offensive techniques, persistence indicators, or malicious sandbox verdict. Ten generated artifacts were inspected without a malicious child finding, although their individual verdicts remain unknown. The document contacted 104.80.224.135 and 18.213.11.84 directly; because contactedHosts is unavailable, no complete reputation assessment exists for those addresses.
What To Do Now
Open the document only in an updated PDF reader with endpoint protection enabled. If the file came from an unexpected or untrusted source, avoid enabling embedded actions or submitting sensitive information through its forms.
Where this verdict could be wrong4 caveats
- The PDF carries acroform and autoaction tags, which increase document attack surface even though no engine identified a malicious payload.
- Direct-IP contacts to 104.80.224.135 and 18.213.11.84 triggered MalwareTips.Synth.DirectIpC2; no complete host-reputation result is available because contactedHosts=null.
- All 10 inspected dropped children have unknown individual verdicts, so hasMaliciousChild=false does not establish that every artifact was benign.
- prevalence.classification=rare_old reflects only 3 submitters and 3 submissions, limiting reputation-based reassurance.
These are the assessment's weak points. If you believe one applies to your file, report the verdict and we'll re-review it.
- 0/76 antivirus engines reported a detection.
- 18 tier-1 engines reported no detection.
- behaviour.offensiveCount=0 and no malicious sandbox verdict.
- No persistence indicators were observed.
- No YARAify, CIRCL, or MalwareBazaar hit was present.
- PDF tags include acroform and autoaction.
- Direct-IP contacts were observed to 104.80.224.135 and 18.213.11.84.
- No complete contacted-host reputation result is available.
- The file has limited prevalence with 3 submitters and 3 submissions.
- Ten child artifacts lack individual verdicts.
Keep endpoint protection enabled and use a fully updated PDF reader. Exercise ordinary caution with embedded forms or automatic actions, particularly if the source was unexpected.
Coverage & freshness
Complete means the check returned a usable result. It does not mean the file is safe.
Antivirus
Complete0 of 76 engines flagged the file.
Sandbox
Complete1 isolated runtime environment contributed observations.
Network
Partial3 runtime contacts were observed without a completed reputation cross-check.
YARA
Complete1 signature or behavior rule matched.
External intel
Complete3 of 3 independent reference sources completed.
Behavior
Plain-English impact first, then the observed runtime evidence.
Runtime flight recorder
Capture complete- 1isolated sandbox run
- 2MITRE ATT&CK techniques
- 3spawned processes
- 3network contacts
- 38filesystem & mutex artifacts
Attack story
Runtime observations grouped by analysis stage. Arrows organize the stages; they do not claim chronology or causality.
Input file
The submitted object
- FileObserved
Intermediate Accounting, Volume 2, 4th Edition -- Kin Lo, George Fischer -- 2, 4, 2020 -- Pearson Education Canada -- isbn13 9780134730370 -- f8dd32e05341aa7c3ad6d5ef45fe95fb -- Anna’s Archive.pdf
286930f0bea43ff4b7dd6bf6a805ab8e3ee69d5f39368f0a2490c80265a52b5c
01Uploaded file
Processes
Runtime execution
- ProcessObserved
Observed process
c:\program files (x86)\adobe\acrobat reader dc\reader\acrocef_1\RdrCEF.exe --backgroundcolor=16514043
02Isolated runtime analysis - ProcessObserved
Observed process
C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroRd32.exe" "C:\Users\user\Desktop\manual.pdf
03Isolated runtime analysis - +1 more recorded observation in Analyst mode
Files
Created or changed
- Written fileObserved
SOPHIA.json
C:\Users\<USER>\AppData\Local\Adobe\Acrobat\DC\SOPHIA\Reader\SOPHIA.json
04Isolated runtime analysis - Written fileObserved
TESTING
C:\Users\<USER>\AppData\Local\Adobe\Acrobat\DC\SOPHIA\Reader\Files\TESTING
05Isolated runtime analysis - +1 more recorded observation in Analyst mode
Network
Hosts contacted
- Contacted hostObserved
8.8.8.8
Contact observed during runtime.
06Isolated runtime analysis - Contacted hostObserved
104.80.224.135
Contact observed during runtime.
07Isolated runtime analysis - +1 more recorded observation in Analyst mode
7 recorded facts from one runtime window. Every fact remains independently traceable in Analyst mode.
What this file did when executed
This file was detonated in 1 sandbox and its runtime behaviour was observed.
Adversary techniques mapped to the MITRE ATT&CK framework.
- 8.8.8.8
- 104.80.224.135
- 18.213.11.84
- C:\Users\<USER>\AppData\Local\Adobe\Acrobat\DC\SOPHIA\Reader\SOPHIA.json
- C:\Users\<USER>\AppData\Local\Adobe\Acrobat\DC\SOPHIA\Reader\Files\TESTING
- Local\08519E50
- Local\0859CAC0
- Local\082E6300
- C:\Users\<USER>\AppData\Local\Adobe\Acrobat\DC\SOPHIA\Reader\Files\ACROBAT_READER_MASTER_SURFACEID
- C:\Users\<USER>\AppData\Local\Adobe\Acrobat\DC\SOPHIA\Reader\Files\DC_READER_LAUNCH_CARD
- C:\Users\<USER>\AppData\LocalLow\Adobe\Acrobat\DC\ReaderMessages-journal
- C:\Users\<USER>\AppData\Local\Temp\A95sg39q_1ujzwyk_1wo.tmp
- C:\Users\<USER>\AppData\Local\Temp\A93e9pf4_1ujzwyl_1wo.tmp
- Local\Acrobat Instance Mutex
- DBWinMutex
- \Sessions\1\BaseNamedObjects\{100184D2-BDC3-477a-B8D3-65548B67914C}_3268
- \Sessions\1\BaseNamedObjects\Local\{100184D2-BDC3-477a-B8D3-65548B67914C}_3572
- \Sessions\1\BaseNamedObjects\Local\Acrobat Instance Mutex
Files this sample writes at runtime
This file drops 10 children at runtime. None are currently flagged malicious in our cache.
- ad27039abac3252c3b39…37ede5Never scannednever seen before
- d3ca71b88a821f847479…c24c58Never scannednever seen before
- 81ff65efc4487853bdb4…7c8e06Never scannednever seen before
- 0fee8c2069802defbe26…d2bbd2Never scannednever seen before
- 71191dd2534f6f16523f…947b02Never scannednever seen before
- e3b0c44298fc1c149afb…52b855Never scannednever seen before
- 0968477fe2b0ad304dca…af7084Never scannednever seen before
- 637d06de23cc8f9feb72…6cd482Never scannednever seen before
- ff06e38f3d807ad79ed5…ce4364Never scannednever seen before
- 189008e362f7df63af93…cc101cNever scannednever seen before
Detection & Forensics
Consensus, attribution, signatures, code structure, prevalence, and identity.
Evidence integrity
Chain of custody for the facts preserved in this report.
- 1rule hit recorded
- 0 / 76engines flagged
- 3sources in submission history
Why these facts are shown
Each statement identifies whether it was directly recorded or derived from saved scan facts.
- 01
0 of 76 antivirus engines flagged the file.
Verdict inputView chapterProvenanceObservedSourceAntivirus analysisObserved at - 02
The hash has been submitted 3 times from 3 sources.
ProvenanceDerivedSourceSaved report factsObserved at - 03
Scanned file: Intermediate Accounting, Volume 2, 4th Edition -- Kin Lo, George Fischer -- 2, 4, 2020 -- Pearson Education Canada -- isbn13 9780134730370 -- f8dd32e05341aa7c3ad6d5ef45fe95fb -- Anna’s Archive.pdf — 286930f0bea43ff4b7dd6bf6a805ab8e3ee69d5f39368f0a2490c80265a52b5c
ProvenanceObservedSourceUploaded fileObserved at - 04
Observed process — c:\program files (x86)\adobe\acrobat reader dc\reader\acrocef_1\RdrCEF.exe --backgroundcolor=16514043
ProvenanceObservedSourceIsolated runtime analysisObserved at - 05
Observed process — C:\Program Files (x86)\Adobe\Acrobat Reader DC\Reader\AcroRd32.exe" "C:\Users\user\Desktop\manual.pdf
ProvenanceObservedSourceIsolated runtime analysisObserved at - 06
File written: SOPHIA.json — C:\Users\<USER>\AppData\Local\Adobe\Acrobat\DC\SOPHIA\Reader\SOPHIA.json
ProvenanceObservedSourceIsolated runtime analysisObserved at - 07
File written: TESTING — C:\Users\<USER>\AppData\Local\Adobe\Acrobat\DC\SOPHIA\Reader\Files\TESTING
ProvenanceObservedSourceIsolated runtime analysisObserved at - 08
Contacted host: 8.8.8.8 — Contact observed during runtime.
ProvenanceObservedSourceIsolated runtime analysisObserved at - 09
Contacted host: 104.80.224.135 — Contact observed during runtime.
ProvenanceObservedSourceIsolated runtime analysisObserved at
Detection sources at a glance
The available sources did not agree on a named threat category.
MalwareBazaar, YARAify, and CIRCL hashlookup completed and returned no entries for this hash.
Signatures and behavior heuristics
Behavioral heuristics matched patterns associated with malware. Corroborating evidence determines how much weight they carry.
The sample contacted an external IP address directly and no application domain was recorded. Direct-IP traffic also occurs in legitimate installers and infrastructure, so this is supporting context only and requires corroboration from host reputation and other runtime evidence.
Evidence104.80.224.135 · 18.213.11.84
0 of 76 engines flagged this file
View all 76 engine results
PE structure
Not applicablePE structure analysis applies to Windows executable formats, not this file type.
How widely this file has been seen
Rarely uploaded, but has been around for a while. Often niche legitimate software or old internal tooling; not a strong malware signal on its own.
Fingerprint and provenance
- File name
- Intermediate Accounting, Volume 2, 4th Edition -- Kin Lo, George Fischer -- 2, 4, 2020 -- Pearson Education Canada -- isbn13 9780134730370 -- f8dd32e05341aa7c3ad6d5ef45fe95fb -- Anna’s Archive.pdf
- Format
- Code signing
- Not applicable to this file type
- Size
- 20.6 MB
- Last analyzed
- Sep 13, 2026, 3:55 AM UTC
286930f0bea43ff4b7dd6bf6a805ab8e3ee69d5f39368f0a2490c80265a52b5cSafety & FAQ
Complete recovery guidance and answers for the next decision.
What to do now
This file appears low risk based on the evidence available now.
- Recovery step 01
Open it only when its sender or download source is one you independently trust.
- Recovery step 02
A clean result reduces known risk, but it cannot guarantee that every new or targeted threat has been detected.
- Recovery step 03
Keep your antivirus and Windows updates switched on so you stay protected.
Safety FAQ
Direct answers grounded in the saved verdict and evidence in this report.
Is this file safe?
What is this file?
How many antivirus engines detected this file?
What is the SHA-256 hash of this file?
Is it safe to open this file?
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Community
Member reviews and reports for this exact file hash.