Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93957b941306dc0…

MALICIOUS

PDF

27.7 KB
MD5: dfa6abc03181f31a2a9b63980a07e57c SHA-1: 32654ae21e8a6853d8b3721b8170f945883b6b49 SHA-256: c93957b941306dc0d69c2c68941e7f95612fb83c1afc2d78884b6a996a330029
166 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with the signature Win.Trojan.Agent-36100. Static analysis detected embedded JavaScript, which is often used to download and execute further stages of a payload. The ML classifier also strongly indicated maliciousness. The document body content appears to be obfuscated or corrupted, providing no clear user-facing lure.

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
9128bca42b7cf1353ea05e09df3b43a69cdc4514baa6bd0349fcf0adf3a940d1		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 27621 bytes
Detection
ClamAV: Win.Trojan.Agent-36100
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
e020c95ff7b6e2d31ce271841987578d8bc8e6afebbc4c417b20baded9ec9b43		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 15189 bytes

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