Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1c29fd86495575…

MALICIOUS

PDF

14.3 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: 4b2d93d5cba0c72f7834de403a94fcc4 SHA-1: 8c5eddf4fa7c7e05984886cd31ceaae476f1750b SHA-256: da1c29fd86495575e048f6f3f1d33f6eb49cebedfc1715b1273bb834e8dd628c
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains embedded JavaScript, indicated by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics. ClamAV detections 'Win.Trojan.Agent-36166' on both the main file and an extracted artifact strongly suggest malicious intent. The embedded JavaScript is likely responsible for executing the payload, as suggested by the 'PDF_JAVASCRIPT' heuristic firing. The exact functionality of the script could not be determined due to its obfuscation or truncation, but the overall pattern points to a malicious PDF dropper.

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
3a70c2ba1f93eabaab889012795505e8cf3515609bbc2a1ddf47b4fc980c8909		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74398 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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