Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e4186c3be8a8fe…

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: c5cd22b693efd8a55e0e0d6c77b95dd3 SHA-1: 9403d9f7c32025676c6e6e25fe015c4ecd378618 SHA-256: b8e4186c3be8a8feb44fa0f8f26d4fa971d5bc76870956ad06bfa4fb20d3cdaf
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 confirm this is a malicious sample, specifically identified as Win.Trojan.Agent-36166. The embedded JavaScript is likely responsible for executing malicious code or exploiting vulnerabilities within the PDF reader. The presence of JavaScript actions and streams strongly suggests an attempt to download and execute further payloads or exploit the user.

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
059b732e5fc71eedfe2ddc7cf76c5a6564d3335edc4e215cf2de69c5d4c096c8		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74883 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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