Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a79e851fd3dc06…

MALICIOUS

PDF

40.0 KB
MD5: 27a900b89f12c2e50c5810994ade6f35 SHA-1: 501d1f4b73ddc65c97e1e4aa92e91258b7c4e85f SHA-256: 58a79e851fd3dc0667b3abf48ff2080f11e3fc6da3834df162d5fb41b6e68ff6
138 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded and obfuscated JavaScript, indicated by multiple heuristic firings. The deobfuscated JavaScript, named 'legacy_pdfkit_stage_000.js', likely attempts to download and execute a second-stage payload. The ClamAV detection of 'Win.Trojan.Agent-36169' further supports the malicious nature of the file. The document body content appears to be malformed or part of the obfuscation, providing no clear user-facing lure.

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
7b2e38c61cb7a59e511aaab2ee972afe1c518f6803b3b99878bbb277ba897208		 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
4abaca22bad0a642d9f924d1767df8cfd487e83d78bd6a44a63e5fb40a02751e		 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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