Malicious PDF — malware analysis report

Static analysis result for SHA-256 49558408f81f8f6c…

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: 441816f9aff826e159b04a31d1b08c7b SHA-1: ece3dc2437e69a4a49fab171245bc2da0f9bf6cb SHA-256: 49558408f81f8f6c5a9a7e2d6af1cf451f972d8c7d0446076c020082a19202d4
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript

The file is a PDF document with embedded JavaScript, identified by heuristics as 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 stream, named 'javascript_obj0007_000.js', is the primary indicator of malicious activity, likely serving as a downloader for further stages of the attack. The document body is unreadable, so the rationale is based solely on the script and AV detections.

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
ef6a03a09394868e2ebd3c9ba3d875e088e7bfa5c2edc3e1d47f41e551ced06f		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74537 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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