Malicious PDF — malware analysis report

Static analysis result for SHA-256 948ceb09e2e32945…

MALICIOUS

PDF

27.8 KB
MD5: 57fae759fa5564b47f29c703b7086863 SHA-1: ffa87c9f036829be0118ec3b65ff8b990908bab0 SHA-256: 948ceb09e2e329451a2b5b9776bff485d21bbc510b886aa247fb5600197e6d6b
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, although large and potentially obfuscated, is the primary mechanism for delivering the malicious payload. The document body content is not human-readable and appears to be obfuscated or corrupted data, providing no direct clues to the 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
1d0c751b8b113f025490df08912313501ef7be44d6a7479c0222be2c454e175f		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 27717 bytes
Detection
ClamAV: Win.Trojan.Agent-36100
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
a07317ab4318ce0e32dc0dfcc2db73121531ec3f48b7f93577aac2c6a722cc2d		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15237 bytes

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