Malicious PDF — malware analysis report

Static analysis result for SHA-256 5955baaaaadb577b…

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: a07960ecf947ddb110541aee2d30b310 SHA-1: a67f01100c6d453961d20d565463f983fdb3768f SHA-256: 5955baaaaadb577b2813fa08896d7a23208d5ba1ab1d79dbf642cee84711c0d0
166 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ClamAV with the signature 'Pdf.Dropper.Agent-7262961-0'. Static analysis also detected embedded JavaScript, indicating a potential dropper functionality. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the 'ML_NYX_PDF_MALICIOUS' heuristic and the ClamAV detection on an extracted artifact ('Win.Trojan.Agent-36166').

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Dropper.Agent-7262961-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7262961-0
  • 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
15d9f6b091bf3bfdd208964556f4f86b7795d8399a4396a80c1be7c11dbb17e9		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 75020 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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