Malicious PDF — malware analysis report

Static analysis result for SHA-256 b417bce4dbee8e5d…

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: 4f304c8e867a89db5f83c5cef942f459 SHA-1: 3278080fba69b86fb981194ef3be80cf46495c79 SHA-256: b417bce4dbee8e5d62eb95392a70975da6a0ca8d4bb9998e0381c38eafed1312
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript

The PDF file contains embedded JavaScript, indicated by heuristic firings for PDF_JAVASCRIPT and PDF_JS. ClamAV detections (Win.Trojan.Agent-36166) on both the main file and an extracted artifact confirm its malicious nature. The embedded JavaScript is likely responsible for executing the malicious payload, although its specific actions are not detailed in the provided evidence. The file's metadata suggests it was authored using PDF Library, a common tool for PDF manipulation.

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
649d152504630127f6a9b9dcf4d269ebaefd823ff40f16e62dddbaba4f0ae825		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74584 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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