Malicious PDF — malware analysis report

Static analysis result for SHA-256 32972249e9aca861…

MALICIOUS

PDF

27.7 KB
MD5: d6acacdccf7f1feefd7b24997bf5b716 SHA-1: 5719086f33c7959fa52d4b31b1c3e2ee250198f0 SHA-256: 32972249e9aca861a8362fa89d28413038ac7997c8cd14c11815362e6340bfc8
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 classification and ClamAV, as malicious. It contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS firings. The embedded JavaScript, particularly the deobfuscated 'legacy_pdfkit_stage_000.js', is designed to execute, likely downloading and executing a second-stage payload. The ClamAV detection name 'Win.Trojan.Agent-36100' is included as an IOC.

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
8ae1dc6b35c931c9765a6c259a38848282150faf3b45f31b5d0880bac9dcbfe1		 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
670b04ad3209a6f37bd119a53278431682fc03749e549e980022cbd4ff8919d1		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.