Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d09b10aac153b9a…

MALICIOUS

PDF

27.6 KB
MD5: d88261e65ac59beeed596fdb5930514e SHA-1: 264ba7d74c0212644cfcd4164251c096d46e0896 SHA-256: 7d09b10aac153b9a4121527544ab5afd893c5569cff3b2e0803a8feaf6147bcc
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file was detected as malicious by ClamAV with the signature Win.Trojan.Agent-36100. Static analysis revealed embedded JavaScript, which is often used to download and execute further stages of a payload. The ML classifier also strongly indicated maliciousness. The SHA256 hash is included as a primary IOC.

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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
88c21abebe09c20c25daf1e9b29eaab2ea9f886d876f338759429c75f04ed21a		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 27477 bytes
Detection
ClamAV: Win.Trojan.Agent-36100
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
1aa83efdcdc492d809ea847951ecbb8320e43a31d6b443ee98bc08e7ce1bec55		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15117 bytes

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