Win.Trojan.Agent-36166 — PDF malware analysis

Static analysis result for SHA-256 b5b7eeb096e091b4…

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: d0d09a9eda4fc02570931e68b886b92d SHA-1: e914b4f1fc6f93c9e8e41ede91f92e301671e9d1 SHA-256: b5b7eeb096e091b45a5272503db9fa710bb382cc8e967f33bede6d6f5f1bd4b1
166 Risk Score

Malware Insights

Win.Trojan.Agent-36166 · confidence 95%

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

The PDF file contains embedded JavaScript, flagged by multiple heuristics as malicious. ClamAV detection confirms this, identifying the sample as Win.Trojan.Agent-36166. The embedded JavaScript is the primary mechanism for executing malicious actions, likely involving the download and execution of further stages.

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
8f6cd2d4775fb7b00de8f236c3301724e439b557a2145651b15601604f98beda		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74436 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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