Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77badac7433b096…

MALICIOUS

PDF

39.9 KB
MD5: 1aee6719b1ef1e992716089cdc7bc213 SHA-1: 16f8460707fdf86aa0faf712271e1f02b473c9e4 SHA-256: f77badac7433b09681092859bb3e32aa31d73c183552b8d7edb1cd8b2df10cde
138 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-36169' strongly suggests malicious intent. The deobfuscated JavaScript, named 'legacy_pdfkit_stage_000.js', likely serves as a downloader or initial execution stage for a secondary payload, though its exact function is obscured by obfuscation.

Heuristics 5

  • ClamAV: Win.Trojan.Agent-36169 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36169
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
516ce8f05483e2a944d3f4c46120a8c05e3c3a351931755a2a0551263da32d66		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2019 bytes
Detection
ClamAV: Win.Trojan.Agent-36169
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
4e225c059cd17abe33884c93d6a7bd250aa680bbb866e1b3f1f0fd18974150d6		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x9FE 2534 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).

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