Malicious PDF — malware analysis report

Static analysis result for SHA-256 623dd483d27a580d…

MALICIOUS

PDF

14.5 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: 4174fb68942945da29c727a96570bca4 SHA-1: bcbad6ce3d95c3ba4505a1125c5b08f33502d31e SHA-256: 623dd483d27a580d8ee296a8cfd851561dfc6b3ae00e9accec543b2ad0b2704c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, flagged by multiple heuristics and a critical ClamAV detection (Win.Trojan.Agent-36166). The JavaScript is heavily obfuscated but appears to be designed to download and execute a secondary payload, a common technique for malware delivery. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
f3b917706e8aea4b50fbb8565d250b0ee05fed1f1864b009a8e7e71396558c91		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 75162 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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