Malicious PDF — malware analysis report

Static analysis result for SHA-256 544ccb46c87c4fc2…

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: eef8ca13150ae81caf31cfb4e36bcf6c SHA-1: 8508428c55c11185c680fbba7108e093451d347d SHA-256: 544ccb46c87c4fc2588fe692779b3ccaadfb0ede9f88235b939f862b5c306d14
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Win.Trojan.Agent-36166'. The presence of embedded JavaScript, identified by PDF_JAVASCRIPT and PDF_JS heuristics, strongly suggests that the document is designed to execute malicious code. This script likely acts as a downloader for a second-stage payload, contributing to the overall malicious nature of the file.

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
71f5306adbd0803852472ce62a34bed5d61e0adf6dfa67e61ff5aaad4ba59d30
pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74348 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely