Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa06222ae78fd06…

MALICIOUS

PDF

27.9 KB
MD5: 85dc1dc84f018387cf122c737fe5e5de SHA-1: 51beebbcfc6b0a09e24d99d01dbf3ac72adb67d6 SHA-256: 8fa06222ae78fd06c79093dcb1a08fb8f04c25b6962ccbaa3d5c38e77871f4cf
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings. The ClamAV detection of 'Win.Trojan.Agent-36100' strongly suggests malicious intent. The embedded JavaScript likely aims to exploit a PDF vulnerability to download and execute a secondary payload, although the specific actions are not fully discernible from the provided evidence. The document body content appears to be obfuscated or malformed, providing no clear user-facing lure.

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
9c373ffc9c9e5c8e1e0c74351243d387ee1e84b88ccc20276cfdf4b5272c9190		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 27765 bytes
Detection
ClamAV: Win.Trojan.Agent-36100
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
10cf2f440d8726c02d4a182e310095c29599a9c258167e14e97c012a736327da		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15261 bytes

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