Malicious PDF — malware analysis report

Static analysis result for SHA-256 612c2330500b7307…

MALICIOUS

PDF

45.0 KB
MD5: 9b733f69e1d4eb2e9819dbe9c86e0b35 SHA-1: e9ebc74005f355fdf5479be8bfd104b6d9c342d0 SHA-256: 612c2330500b73075196aa14f65ec32a72d1728a5907b0a7113a5c5f7f22af5c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript streams, identified by multiple heuristics and ClamAV detection as malicious (Pdf.Exploit.Agent-36128). The JavaScript appears to be obfuscated but is designed to execute code, likely to download and run a second-stage payload. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Exploit.Agent-36128 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36128
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
1456a9b44155e308e351f86a226eee9d4cd3459d8ac628bf1fefc3d81844334c		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
javascript_obj0008_001.js
69ca055938ea82e6e85815343c66dc281a63780178a1fa58442647ddeeeea0ff		 pdf-javascript-stream PDF /JS object 8 at offset 0x20A 45555 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36128
Obfuscation or payload: unlikely
legacy_pdfkit_stage_000.js
e3ee3197ed2d3632ee47a3d8b256f0418919a048985744c95b3397785c123266		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

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