Win.Trojan.Agent-36166 — PDF malware analysis

Static analysis result for SHA-256 07a36d3ed5ddad24…

MALICIOUS

PDF

15.0 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: a22d24275d3aaadf020f690b4156ad69 SHA-1: c09658a62ec5f6997a4a2223114b3e00228bb098 SHA-256: 07a36d3ed5ddad24b0e220dcfc755870601e7dc311f2e3f8dc3b2c98453ffa36
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 identified as malicious by ML classifiers and ClamAV, which specifically names it as Win.Trojan.Agent-36166. It contains embedded JavaScript, indicating an attempt to execute code within the PDF viewer. This script likely serves to download and execute a second-stage payload, a common technique for trojan agents.

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
a0b9f4a9b7416c068be9766a7c27e92307cfd1463619ee3acfc2021bf26c5a8c		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 84130 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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