Malicious PDF — malware analysis report

Static analysis result for SHA-256 71de2a5f03512dc8…

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: c772920492991b019a0921089bb95193 SHA-1: cea08cf29dd3d3e1096d805c2b4eec2f6677acdd SHA-256: 71de2a5f03512dc84c7f46f337d85047768d025d91d62909082287abffd7ceec
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains embedded JavaScript which is designed to download and execute a secondary payload, as indicated by the ClamAV detection name 'Win.Trojan.Agent-36166'. The obfuscated JavaScript makes it difficult to determine the exact download URL or execution method without further dynamic analysis.

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
b79ea9d95c331ad356f137b6623181ae8ec9359787977911f74b9522adaa0f57		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74775 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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