Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75c9aedfb0991ff…

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: 1d0b9983c35ca9986126e09d6ffab38d SHA-1: 5041163982c91e8b4a8db7d40a07e26aab7bd7b1 SHA-256: c75c9aedfb0991ffe199249362e63c0b66ed0ce612115bce1239ef7bb59af661
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The file is a PDF document that triggered critical heuristics for ClamAV detection, identifying it as Win.Trojan.Agent-36166. Additionally, it contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. This JavaScript is likely responsible for downloading and executing a second-stage payload, contributing to the overall malicious nature of the file. The specific JavaScript content was too obfuscated to determine its exact actions beyond payload delivery.

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
7935bd1f0f23c6188adab8e7be9ffa4248d38b12d7afe4e39889085e4e6735ae		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74947 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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