Malicious PDF — malware analysis report

Static analysis result for SHA-256 54adb92339d37535…

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: dd7cbff1c095b11abe292b30f48c324d SHA-1: 1d63b3f5a731334999c169446dfd1f74eb1bd36d SHA-256: 54adb92339d3753575fbbc860356e110f3bc5044e5ce25f50faf918356562d10
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Win.Trojan.Agent-36166'. It also contains embedded JavaScript, which is often used to download and execute further malicious content. The ML classifier also strongly indicated maliciousness. The document body is unreadable, but the presence of JavaScript and the ClamAV detection strongly suggest a downloader or agent trojan.

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
bd4ffcb1806ca42e838f28854976ed40d5fa1a6599a53c9ac97da54072ef38c3		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74765 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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