Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66c168ac94194b9…

MALICIOUS

PDF

40.0 KB
MD5: 0039f98d3e56c87b84847e0604d73d5f SHA-1: 7cfa5f57700db1df065ebf7e2145136c7f37be15 SHA-256: e66c168ac94194b9de32576e77b87f00947d906bf370bb781aa736e45a39bc4d
138 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, identified by heuristics as PDF_JAVASCRIPT and PDF_JS. The deobfuscated JavaScript, legacy_pdfkit_stage_000.js, appears to be designed to download and execute a second-stage payload. ClamAV detection as Win.Trojan.Agent-36169 further supports the malicious nature of the file. The exact URL or execution method is obfuscated within the script.

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
b876422271733afce2f9bd164d8b243ae9f818edb143c9a948b36f1b6bda8391		 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
ecef8c2cfb1478dfd65c9b910d69c5ef07805909a65cc3ddd5c942deecc6f5d4		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x9FE 2540 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).

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