Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a8386032e59fc2…

MALICIOUS

PDF

27.7 KB
MD5: dc5ec2c81d897c4afdcba99c05760cc0 SHA-1: 2c7174065a87622b32c95c97ff784e09dd0c1d79 SHA-256: 34a8386032e59fc2310a3df7b5e8ee28d18a0ad0cb4e5c671ed3cd6021692029
166 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious content. The presence of embedded JavaScript, identified by PDF_JAVASCRIPT and PDF_JS heuristics, suggests an attempt to execute code. ClamAV detection of 'Win.Trojan.Agent-36100' strongly points to a known trojan, likely a downloader or agent, which is consistent with the execution of embedded scripts. The document body content appears to be obfuscated or malformed, providing no clear user-facing lure.

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
0971b0e0e8b931d6ef26a9998cb065dad76587d0df16697b1e05d721425cdced		 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
58fe3e7c2f94d2d7b4b298ec1f10b615e22c74044e199181d3016ed2195acefb		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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