Malicious PDF — malware analysis report

Static analysis result for SHA-256 3985e9830c4877d9…

MALICIOUS

PDF

14.4 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: 12242f69d61c24af4bb6a0e2e23da439 SHA-1: 01996deb8f25fcfe6419059ab77cbca2127d4138 SHA-256: 3985e9830c4877d9edf0b0e7a25504fdcbbaec8e482f7ce67bc3460609f8f82a
138 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. ClamAV detection confirms the file is malicious, identifying it as Win.Trojan.Agent-36166. The embedded JavaScript is likely used to exploit vulnerabilities within the PDF reader or to download and execute a secondary payload. The document body is unreadable, but the presence of JavaScript and the ClamAV detection strongly suggest a malicious intent.

Heuristics 5

  • ClamAV: Win.Trojan.Agent-36166 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36166
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
820922e7535c62a10751b48f60b17b4e6207f0ff9d13bc51c2619c7d272bab6e		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74807 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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