Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2f35f1caf6b34e…

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: 92ac1e6f691a4b554394af0339127374 SHA-1: 366f24aff7b026767f495bb3ed6308e77f5f7148 SHA-256: 9b2f35f1caf6b34e6a65009c3ad4e5128d8e7fdf7953dc0893402afea842e3db
166 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection identifying it as 'Pdf.Dropper.Agent-7685807-0'. Additionally, an embedded JavaScript stream was detected, which is commonly used by malicious PDFs to download and execute further stages. The extracted artifact also triggered a ClamAV detection for 'Win.Trojan.Agent-36166', indicating a multi-stage infection. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Dropper.Agent-7685807-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7685807-0
  • 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
72d681884d0614310d9baa338ebfbbf225f0c328f2c663ee2fccbb18939c49e7		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 74676 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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