Malicious PDF — malware analysis report

Static analysis result for SHA-256 13824e01b8484970…

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: a52dc00bfbb7b5064e91f3a23423227c SHA-1: e1d79cc0d88a76e9a0af4e65e6bcc9834e209bcc SHA-256: 13824e01b84849701c41ae8255480f25f17da479d45cc85d6c0915947697042c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, which identified it as Win.Trojan.Agent-36166. Embedded JavaScript was detected, indicating an attempt to execute code within the PDF. This JavaScript is likely responsible for downloading and executing a secondary payload, a common tactic for this type of threat.

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
fcb1b5eb9abb422e84cbe33013ca70f00bac86ed801e42453638c25f6c2e7f31		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 75111 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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