Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda59280adbf9fdf…

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: 1d267d010a809c1f818d906d6f19d2c9 SHA-1: 502b81b27873c6be65a6857a0d5762b076b051e9 SHA-256: fda59280adbf9fdf249b108644ebe7cf9c96bbb1375adcfc2c56b7c82d2c19d9
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The file is a PDF containing a large JavaScript stream, flagged by heuristics as a PDF JavaScript action and an embedded JS stream. ClamAV identifies the file as Win.Trojan.Agent-36166. The JavaScript's presence and the ClamAV detection strongly suggest it is used to download and execute a malicious payload. The SHA256 hash of the PDF itself is included as an IOC.

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
6a0454ee2b47a4d4b5ff5db1298faee554128e51cffb7746570f964904e9cb20		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74806 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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