Malicious PDF — malware analysis report

Static analysis result for SHA-256 a060dd8885cbe910…

MALICIOUS

PDF

15.1 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: 608f51d44c9dd31886078e56afd6afdb SHA-1: 6e8670242841e29602c62b33d7fb51e5867ceed8 SHA-256: a060dd8885cbe910d9624a87d64df0305b28d60db285080d8709a09b8abf82de
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The file is a PDF document that contains embedded JavaScript, as indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. ClamAV detection confirms this is a known malicious file, identified as Win.Trojan.Agent-36166. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, which is a common technique for malware delivery. Due to the nature of the embedded script and the ClamAV detection, the confidence in this assessment is high.

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
8c97f0177e0832b562e5f7e67ec1b1757eb220359db56f82898a4457f235efea		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 84217 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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