Malicious PDF — malware analysis report

Static analysis result for SHA-256 610771c641607234…

MALICIOUS

PDF

27.8 KB
MD5: 7a90641a444d59848c3a4566a489d1aa SHA-1: 989dc331e52c2e25b1550464a7bc0bcf92e58ac8 SHA-256: 610771c641607234c81d12880af146dee678a3ede63bf12fcf4b2839e0eeb43a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, flagged by multiple heuristics and a critical ClamAV detection (Win.Trojan.Agent-36100). The JavaScript appears to be obfuscated but is designed to execute malicious actions. The presence of JavaScript within a PDF strongly suggests an attempt to exploit the user via a malicious attachment, likely for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
30d5b2ef9905624ac936af73aef67a35a8dca59cac2b84568ad5d45234a0dfde		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 27717 bytes
Detection
ClamAV: Win.Trojan.Agent-36100
Obfuscation or payload: unlikely
javascript_obj0008_001.js
4ce94318fe987af29495a018f0b77243cfca13f41e6af1d9c6a9283f65b216eb		 pdf-javascript-stream PDF /JS object 8 at offset 0x20A 27967 bytes
Detection
ClamAV: Win.Trojan.Agent-36100
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
b4aefe4768f3e316b4fd888f3da0b513c9c5c6e2fcc4c33922b94b7408a7ccba		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15237 bytes

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