Malicious PDF — malware analysis report

Static analysis result for SHA-256 7818b38927197f39…

MALICIOUS

PDF

45.0 KB
MD5: af7a80c6b319ddb07f579a0abfe2f39f SHA-1: b0f9cd5a899a3f22893e4d9bbdd7560ffbe2ae6a SHA-256: 7818b38927197f39c101a6b6786da7378568d06a945d105721e15f4882f7cff7
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, flagged by multiple heuristics as malicious. The JavaScript appears to be heavily obfuscated but is designed to execute code, likely to download and run a secondary payload. The ClamAV detection of 'Pdf.Exploit.Agent-36128' further confirms the malicious nature of this exploit-laden PDF.

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
32e9dc6f79e906e87a681265b35ae4a766c043238c525631ad701d290d45c35d		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 45305 bytes
javascript_obj0008_001.js
8299f7d78022fa11014b73cc2cc90ea90f4f1ebcb0d64ec62086f644b5906797		 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
7413786b3843ecb07d917e1f0a6e0763983f7b35191fbf8b5217d5387a2440f6		 deobfuscated-js double percent-decoded annotation JavaScript at offset 0x1E7 33047 bytes

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