PDF malware analysis — malicious · 9ac2a45a175db1c0

MALICIOUS

PDF

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

MD5: 308f8eb57b0d6282a57e60620bfdb561 SHA-1: 56d45b6a8d7d856cec4d41806b8d3fea028fc979 SHA-256: 9ac2a45a175db1c0516f09ee46c17fa30e9cd2f81fe389c8c78f9493af280b42

208 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier and ClamAV detection (Pdf.Exploit.Agent-35587) strongly suggest malicious intent. The embedded JavaScript likely exploits a PDF vulnerability to download and execute a secondary payload, as suggested by the ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics.

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` `73b0a5ee8d373576a69b815f21ceb0b26b4e621da8e63910bb9eb889225d28c1`	pdf-javascript-stream	PDF /JS object 7 at offset 0x21C	29903 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` `7a9d5b9625a34cb937c5114925f94939d392b1c33c28d9f63e61233c170478ab`	pdf-javascript-stream	PDF /JS object 7 at offset 0x21C	28929 bytes

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