Win.Trojan.Agent-36166 — PDF malware analysis

Static analysis result for SHA-256 14ebfbc802bb5e30…

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: 00d052bc6904cd8bf15740ebbcf64ede SHA-1: 4f3aa3613fd81aace6ae6351529f05c29aa72706 SHA-256: 14ebfbc802bb5e300cbdc32f23f859f4ac6b4720321de8d7d5a9820595da6ee9
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 a machine learning classifier. ClamAV identifies the sample as Win.Trojan.Agent-36166. The JavaScript appears to be obfuscated but is designed to download and execute a secondary payload, indicated by the large size of the script and its typical behavior in such documents.

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
f394efd08955575cccfc6b1aed4e4b6d0d5a351ecc8e57044a845299046a7195		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74781 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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