Win.Trojan.Agent-36166 — PDF malware analysis

Static analysis result for SHA-256 7baf4ecb0e142b12…

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: 12f6436ce3d4556bb0eb468539d05230 SHA-1: aceee4c038abdce638d5491b5a68d4c9c491dd83 SHA-256: 7baf4ecb0e142b12c9cb3efec0e38341a0a75a9251c9ab73b75ac71030b61031
166 Risk Score

Malware Insights

Win.Trojan.Agent-36166 · confidence 95%

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

The file is a PDF containing embedded JavaScript, flagged by multiple heuristics and a machine learning classifier as malicious. ClamAV identifies it as Win.Trojan.Agent-36166. The JavaScript is heavily obfuscated but its presence and the ML/heuristic detections strongly suggest it's designed to exploit a vulnerability and download a secondary payload, consistent with a trojan agent.

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
83a73d5e6acf22f49db2937d59c7554a12fff7b2843ca8d441c78fbb110ba099		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74612 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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