Win.Trojan.Agent-36166 — PDF malware analysis

Static analysis result for SHA-256 d99112b102981a53…

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: 9da2f5ae44893fe7f0ad259a40da2342 SHA-1: 6b7a5fbf0e534074edd487501ecd7e558b4c9414 SHA-256: d99112b102981a53de9e1c0498d913360780868fd089ea07d81a30024764fa82
166 Risk Score

Malware Insights

Win.Trojan.Agent-36166 · confidence 95%

MITRE ATT&CK
T1059.001 JavaScript/JScript T1204.002 Malicious File

The file is a PDF containing embedded JavaScript, flagged by multiple heuristics as malicious. ClamAV identifies the sample as Win.Trojan.Agent-36166. The embedded JavaScript is likely responsible for executing the malicious payload, as indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. 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
0d34396f26a38d04e310aa6f2af2562febe40294c292b7e2e2ab3ab4b35c52f9		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 73998 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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