Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ce8ef9fbacfdd6…

MALICIOUS

PDF

27.7 KB
MD5: 19e362dce16ee028490d050703f221e7 SHA-1: 35fc6470d704e1cb7eb8fa2cf6ef82e663cf0166 SHA-256: 40ce8ef9fbacfdd6ac2f032d61d50c8c5132a295bfaa18903b9195c0ccef470a
136 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. ClamAV detections (Win.Trojan.Agent-36100) confirm its malicious nature. The embedded JavaScript is likely responsible for the malicious behavior, potentially downloading and executing a second-stage payload. The document body content is heavily obfuscated and does not provide clear user-facing lures.

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
c31cedc56375325d260eb5cad93a5dd235b710f032dcf96eddddd2a5680c7483		 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
b91a5457422ae96fb58881c0813b68117a2a8d5d4e5df00dbb51d7ca114efe41		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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