Malicious PDF — malware analysis report

Static analysis result for SHA-256 3242697fc132b5f3…

MALICIOUS

PDF

27.7 KB
MD5: d698c6d38af5748214843248470ce73f SHA-1: 10903ff466398660dc5b26c357f1fece769ba2fc SHA-256: 3242697fc132b5f3bbf83a497ae67ee7dc5dfcb03cd3f32568969f7441398b35
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. ClamAV detections for 'Win.Trojan.Agent-36100' on both the main file and an extracted artifact strongly suggest malicious intent. The embedded JavaScript is likely responsible for the malicious behavior, potentially downloading and executing a second-stage payload, though its exact function is obscured by obfuscation.

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
b0a9875973872bc6c0bc94ae7d6a4557b94f35d5678bc6d0f83a51aa927e37db		 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
355c22a22aa6c3411d55ed8115843c1d8c0977587214eca1f6352aa5b3aeed7c		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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