Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da09d97ad3e32ff…

MALICIOUS

PDF

27.6 KB
MD5: a4093b7ace4ddb6905abb7cda50aa7b3 SHA-1: 4003a27064f6e276bdf16557b14896b5c290d7ee SHA-256: 9da09d97ad3e32ff3345b0a68d96d2fbda8aab1ed50cfa25bd9cf65cb7c80864
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded and obfuscated JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. ClamAV detections (Win.Trojan.Agent-36100) confirm the malicious nature. The JavaScript is likely designed to download and execute a second-stage payload, a common technique for malware delivery. The document body content is heavily obfuscated and does not provide clear user-facing text.

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
669327aa804e160dbfc4bc1d2067768a5a53abb3af17ae2026e9428ca3ecffc5		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 27477 bytes
Detection
ClamAV: Win.Trojan.Agent-36100
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
91665a33aaf3ba35499286822a2dec6c65a8849caac1b36a51c8f96d2bb8e235		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15117 bytes

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