Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca894ed986ca040…

MALICIOUS

PDF

15.1 KB Created: 2009-11-15 19:41:70 Authoring application: PDF Library 4.3.9 (via PDF Library 3.9.7)
MD5: c2b6425a3a7ee28e7f4de86d73d21b2c SHA-1: e3592356a3bf3afd769325bdd8c9956b76484772 SHA-256: 6ca894ed986ca040b94ef2ff94f0afa4226dbd872096bd0ae1f920f0a62c5755
168 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, with ClamAV identifying it as Win.Trojan.Agent-36166. Embedded JavaScript was detected, indicating an attempt to execute malicious code. The primary function appears to be downloading and executing a second-stage payload, likely leveraging a PDF vulnerability for initial execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
40215dbcf47b3cf4340ee6b879b6bc32c9d86029a008c66bd84b1b474fd5ef29		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 84137 bytes
Detection
ClamAV: Win.Trojan.Agent-36166
Obfuscation or payload: unlikely

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