Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3d0851bc173d77…

MALICIOUS

PDF

14.5 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: 7277a830a478453be45b5619e8a37823 SHA-1: 525c66866b8d346bd46614fc591445f8ae62afe8 SHA-256: 7e3d0851bc173d774ab655c6677cff8a3a0e913b05d87e89ab89eecb2bea88a6
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple engines, including a critical ClamAV detection for 'Win.Trojan.Agent-36166'. Static analysis revealed embedded JavaScript, indicating an attempt to exploit vulnerabilities within the PDF reader to execute code. The JavaScript is heavily obfuscated, but its presence strongly suggests the file's purpose is to download and run a secondary malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
cae23bc46a8e58fde61e86c9631f939be510bb571774599627a7cec9180a61b6		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74760 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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