Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdab8926f8864755…

MALICIOUS

PDF

27.7 KB
MD5: fe546f029526ad8b70414ac45312f27f SHA-1: a29695002de070750aae153fc2fb5e128f081ec3 SHA-256: cdab8926f8864755534b6aa47d593dbed288ae9934131223b67a3d42f6d1d659
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection identifying it as Win.Trojan.Agent-36100. Embedded JavaScript streams were found, indicating the potential for script execution. The ML classifier's high score and the ClamAV detection strongly suggest this PDF is designed to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Win.Trojan.Agent-36100 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36100
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
716e4e158e25baa5cdacf40e13e8d3d44170da17cbeb1fd8f53f19856f004611		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 27621 bytes
Detection
ClamAV: Win.Trojan.Agent-36100
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
51d9553298cc56b34a7d2685f80f5825192f7e4b0169082e19a226f04b380295		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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