Safe
Legitimate JoPDF installer signed by Chengdu Lightspeed Gravity; zero tier-1 detections; heuristic rules reflect normal installer behaviour.
8b7efdd526ffe15241…d952b0fe05The verdict, reasoned out.
Not a rules engine. The MT AI Engine reads every signal we collected, weighs them against history, and commits to an answer.
The sample shows zero malicious detections across 69 engines, including all major tier-1 vendors (BitDefender, Kaspersky, ESET-NOD32, Fortinet, GData, Avast, AVG, Avira, DrWeb, Emsisoft, F-Secure). The file is signed by a real publisher and the certificate is valid. The filename and contacted URL both reference JoPDF, a known legitimate PDF editor product. The two heuristic rules that fired — process injection and direct-IP C2 — are common to legitimate installers that unpack payloads in-memory and download from CDNs. The contacted IP addresses resolve to Google and Fastly infrastructure, not attacker C2 servers. No malicious sandbox verdict, no malicious dropped children, and no malicious contacted hosts were observed.
Each signal cites a concrete token from the evidence the arbiter saw — engine name, MITRE technique, signer string, or an exact count.
engines: 0/69 malicious; tier1Malicious=0; tier1ReportedClean=16 (Avast, BitDefender, Kaspersky, ESET-NOD32, Fortinet, GData, F-Secure, Emsisoft, Avira, AVG, DrWeb all silent)
signing.verified=true for 'Chengdu Lightspeed Gravity Technology Co.'; signerStats.found=false (no prior history, but signer is real and certificate valid)
contacted URL 'https://cdn.jopdf.com/download/jopdf/jopdf-win-x64_setup.exe' matches filename 'jopdf-win_installer.exe' — legitimate JoPDF product; contacted IPs include 8.8.8.8 (Google DNS), 142.251.179.94 (Google), 199.232.214.172 (Fastly CDN)
behaviour: T1055 (Process Injection) is single offensive technique; 9 ambient techniques consistent with installer unpacking; no malicious sandbox verdict; no malicious dropped children; no malicious contacted hosts
triggeredHeuristics: ProcessInjection and DirectIpC2 are heuristic rules common to legitimate installers; no tier-1 engine corroboration of malware family
- Zero tier-1 malicious detections (16 tier-1 engines clean)
- Valid Authenticode signature from real publisher
- Filename and contacted URL both reference legitimate JoPDF product
- Contacted infrastructure is legitimate (Google, Fastly CDN)
- Medium prevalence (11 submissions) consistent with known product
This file is safe. It is a legitimate JoPDF installer with a valid signature and zero tier-1 detections. The heuristic alerts reflect normal installer behaviour (in-memory unpacking and CDN-based delivery), not malware indicators.
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
- 192.178.218.100
- 172.67.68.9
- 199.232.214.172
- 199.232.210.172
- 142.251.179.94
- 192.178.210.101
- https://cdn.jopdf.com/download/jopdf/jopdf-win-x64_setup.exe
- C:\Users\<USER>\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\9C6Q2GAH\jopdf-win-x64_setup[1].exe
- C:\Users\user\AppData\Local\Microsoft\Windows\History
- C:\Users\user\AppData\Local\Microsoft\Windows\INetCache
- C:\Users\user\AppData\Local\Microsoft\Windows\INetCookies
- C:\Users\user\AppData\Local\Temp\jopdf-win_installer_log.txt
- jopdf-win_installer
- \Sessions\1\BaseNamedObjects\jopdf-win_installer
- \Sessions\1\BaseNamedObjects\DBWinMutex
Files this sample writes at runtime
This file drops 2 children at runtime. None are currently flagged malicious in our cache.
- e3b0c44298fc1c149afb…52b855Never scannednever seen before
- 1487563b9c3a7733a642…26f12dNever scannednever seen before
YARA + heuristic rules that fired
A researcher-curated or high-severity heuristic rule matched this sample. These rules target specific malware families and are near-definitive.
MITRE T1055 (Process Injection) observed — CreateRemoteThread / APC / reflective-DLL injection. The payload is being smuggled into a legitimate process to bypass AV hooks.
Evidence"C:\Users\user\Desktop\jopdf-win_installer.exe"Sample contacted 7 external IP address(es) and zero domains. Benign software virtually always uses DNS; no-DNS direct-IP C2 is a strong malware indicator because it bypasses reputation systems and dodges domain-based blocklists.
Evidence8.8.8.8 · 192.178.218.100 · 172.67.68.9
0 detections across 73 engines
Section entropy & packers
Section-level entropy and packer detection from the PE header. Nothing suspicious here — entropy is within the normal range for unpacked code.
How often this file shows up in the wild
Moderate prevalence — neither rare nor common. No strong prior applies.
Forensic fingerprint
- File name
- jopdf-win_installer.exe
- Size
- 1.30 MB
- MIME type
- (unknown)
- Detected type
- Win32 EXE
- SHA-256
- 8b7efdd526ffe15241d41ed4f50165223d2be34a85873e63711f65d952b0fe05
- MD5
- 4a063f5465afae12ebecca3f414a3177
- SHA-1
- 229ec2d225c7781539203f844eb309fa7d5d29e8
- PE imphash
- d94a787fcec6c876c7c25479495918bd
- First seen (VT)
- 7/8/2026, 12:24:38 PM
- Last analysis (VT)
- 7/8/2026, 12:24:38 PM
- First scan (MalwareTips)
- 7/10/2026, 2:20:46 AM
- Last scan (MalwareTips)
- 7/10/2026, 2:20:46 AM
- Code signer
- Chengdu Lightspeed Gravity Technology Co.verified
Reviews & malware reports(0)
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