Malicious PDF — malware analysis report

Static analysis result for SHA-256 5960b8c7d5780789…

MALICIOUS

PDF

27.7 KB
MD5: 67847aacef6d6ef5e4eaa1783c5877fa SHA-1: 1644245484eab8e5554bb72817673fa0475b0e5b SHA-256: 5960b8c7d5780789fcdbd487c71c0a79a73334ead46ad7020c924528d98e65f6
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings. The ClamAV detection of 'Win.Trojan.Agent-36100' strongly suggests malicious intent. The JavaScript is likely used to exploit vulnerabilities within the PDF reader or download a secondary 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
204754acbfc7a1585ae4717cf3130843acb6fc4c0aed99841198236de3eeb1a0		 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
f6b59a8e59963e70b68920d75c75dd745c0a79b5ccbff3e7796bb6db3421be87		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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