Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13bd57ac65d2a08…

MALICIOUS

PDF

45.0 KB
MD5: e0682fabf8bc5b40bef363949fdc6c25 SHA-1: e79387d9b46ea7048625aae7f3e1810e7cbd6c82 SHA-256: b13bd57ac65d2a08a7de2d047a5cf1923801d7aed46659c7fd77af90a5d28729
168 Risk Score

Malware Insights

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

The PDF was flagged as malicious by ClamAV with the signature Pdf.Exploit.Agent-36128, and a machine learning classifier also assigned a high probability of maliciousness. The presence of embedded JavaScript streams, identified by PDF_JAVASCRIPT and PDF_JS heuristics, indicates that the PDF is designed to execute code. While the specific JavaScript content is not detailed here, its presence strongly suggests an exploit attempt, likely leading to the download or execution of a secondary payload.

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
cca4a78439486aede313d55507f65cd85a669dc03fdaa189403ab555b6aca58d		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
javascript_obj0008_001.js
78c24bfe9b1998593aca70a23f769ef1bfc55ae48722be2f6d61c85fa250e39e		 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
9b2c152a164b439e65259eb8b912473a3db3d04b48d7b3f1f12433a3cd7aff63		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

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