PDF malware analysis — malicious · 56cc4c64e7c31bfa

MALICIOUS

PDF

30.5 KB Created: 2009-05-01 21:21:45 Authoring application: ghjkSFghjkCPx (via afdsdgf)

MD5: f5838644dee9b636f9bbc12a9840a81c SHA-1: 88c15cf96f611b04e07e701748f7d5a07a7d0484 SHA-256: 56cc4c64e7c31bfac6b111345534b458d3d3900ccaf7804f3db8b0a12e43c332

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a high-confidence eval() call (PDF_EVAL) and a strong ML classification (ML_NYX_PDF_MALICIOUS) suggest malicious intent. ClamAV detection (Pdf.Exploit.Agent-35587) further confirms this. The JavaScript is obfuscated, making its exact function difficult to determine, but it is likely designed to download and execute a secondary payload, a common technique for PDF-based exploits.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Exploit.Agent-35587 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35587
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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `9dc722db2a0081bd80450631118bb5c039fd6d15c34ecdf3efd2591387af1a3e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x21C	30021 bytes
Detection ClamAV: Pdf.Exploit.Agent-35587 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `b1b74df97ce6d7e095b258beb6938356f4e189474c066c4f8a82e08570907dcd`	pdf-javascript-stream	PDF /JS object 7 at offset 0x21C	29028 bytes

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