Is Computer-Networking-A-Top-Down-Approach-8th-Edition.pdf safe?
No engine flagged this long-established PDF, although embedded JavaScript and automatic-action features warrant opening it in an updated, protected PDF reader.
All 75 antivirus engines returned no malicious or suspicious detection, including 17 tier-1 engines, and the PDF has circulated broadly since 2021. Its embedded JavaScript, automatic actions, forms, and encryption are cautionary features, but no threat intelligence or engine evidence corroborates abuse.
6f0f3a20e828542e8b…63baf3b4ea71cbRecommended 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.
All 75 antivirus engines returned no malicious or suspicious detection, including 17 tier-1 engines, and the PDF has circulated broadly since 2021. Its embedded JavaScript, automatic actions, forms, and encryption are cautionary features, but no threat intelligence or engine evidence corroborates abuse.
The antivirus results are uniformly non-detecting: 0 of 75 engines flagged the file, and all 17 reporting tier-1 engines found no threat. The document is also well established, with 509 sources and 543 submissions dating back to 2021. Research feeds produced no matching malware record or YARA rule. However, embedded JavaScript, automatic actions, forms, and encryption can increase PDF risk and should not be treated as proof of harmlessness by themselves. No sandbox run or complete host-reputation check is available, so the conclusion rests on static scanning, prevalence, and external intelligence.
What We Detected
No malicious or suspicious result was reported by any of the 75 antivirus engines. This includes 17 tier-1 engines, such as Avast, BitDefender, ESET-NOD32, Kaspersky, Microsoft, and Fortinet.
Threat Behavior
The PDF is tagged as encrypted and contains forms, embedded JavaScript, and an automatic action. Those capabilities can be used legitimately in interactive documents, but they can also be abused. No completed sandbox observation is available, and no complete host-reputation result was recorded, so runtime activity cannot be assessed.
What To Do Now
Open the document only if it came from an expected source, using a fully updated PDF reader while endpoint protection remains enabled. Disable JavaScript within the PDF reader if interactive functionality is unnecessary, and avoid clicking unexpected links or permitting external actions.
Where this verdict could be wrong3 caveats
- The PDF has file.tags including autoaction and js-embedded; these features can support document exploits or deceptive actions even though no engine currently detects a threat.
- The encrypted tag may limit static inspection of some content.
- No sandbox execution or complete contacted-host reputation check is available.
These are the assessment's weak points. If you believe one applies to your file, report the verdict and we'll re-review it.
- 0/75 engines reported a malicious or suspicious result.
- engines.tier1ReportedClean=17 and engines.tier1Malicious=0.
- 509 unique sources submitted the file 543 times.
- The file has been known since 2021-10-13.
- YARAify, CIRCL, and MalwareBazaar returned no threat hits.
- Embedded JavaScript is present in the PDF.
- An automatic-action feature is present.
- Encrypted content may reduce static inspection visibility.
- No completed sandbox observation is available.
- No complete contacted-host reputation result is available.
Use an updated PDF reader with endpoint protection enabled, and open the file only if its source is expected. Consider disabling PDF JavaScript and automatic actions when they are not needed.
Coverage & freshness
Complete means the check returned a usable result. It does not mean the file is safe.
Antivirus
Complete0 of 75 engines flagged the file.
Sandbox
PartialRuntime data is present, but no completed sandbox environment is recorded.
Network
Not runNo contacted-host reputation check is recorded.
No timestamp recordedYARA
CompleteRule evaluation completed with no recorded matches.
External intel
Complete3 of 3 independent reference sources completed.
Behavior
Plain-English impact first, then the observed runtime evidence.
Runtime behavior was not available
The report does not treat a missing runtime observation as a clean result.
Detection & Forensics
Consensus, attribution, signatures, code structure, prevalence, and identity.
Evidence integrity
Chain of custody for the facts preserved in this report.
- 0rule hits recorded
- 0 / 75engines flagged
- 509sources 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 75 antivirus engines flagged the file.
Verdict inputView chapterProvenanceObservedSourceAntivirus analysisObserved at - 02
The hash has a long, established submission history across 509 sources.
Verdict inputView chapterProvenanceDerivedSourceSubmission historyObserved at - 03
No completed runtime observation is available for this file.
ProvenanceDerivedSourceRuntime coverageObserved 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.
YARA rules
No matchesThe rule pass completed without a saved public match.
0 of 75 engines flagged this file
View all 75 engine results
PE structure
Not applicablePE structure analysis applies to Windows executable formats, not this file type.
How widely this file has been seen
Widely seen in the wild for a long time. High prior this is legitimate; isolated detections on common-old files are usually false positives.
Fingerprint and provenance
- File name
- Computer-Networking-A-Top-Down-Approach-8th-Edition.pdf
- Format
- Code signing
- Not applicable to this file type
- Size
- 58.9 MB
- Last analyzed
- Sep 9, 2026, 7:03 PM UTC
6f0f3a20e828542e8b846d795d480972f26340f7c32689bf5563baf3b4ea71cbSafety & 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 Computer-Networking-A-Top-Down-Approach-8th-Edition.pdf safe?
What is Computer-Networking-A-Top-Down-Approach-8th-Edition.pdf?
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Community
Member reviews and reports for this exact file hash.