Win.Trojan.Agent-36166 — PDF malware analysis

Static analysis result for SHA-256 6c773084dbaddb2a…

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: f886ee0b251ce630410286d3c41e9a4a SHA-1: fc511a73ed3d67e4c7b0e78bbf05ab6ab9ba7435 SHA-256: 6c773084dbaddb2ab2fbf82e6e4e60558688d7a34d52a13aa526c73536aa23ee
166 Risk Score

Malware Insights

Win.Trojan.Agent-36166 · confidence 95%

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, flagged by multiple heuristics, and is identified by ClamAV as Win.Trojan.Agent-36166. The JavaScript appears to be heavily obfuscated but is designed to download and execute a secondary payload, a common technique for this family. 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
4246fb805c7c0825aae7741064d6a65f6ce76c5b207ab731957989163efc073d		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74376 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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