PDF malware analysis — malicious · 9bb60d26d998a09a

MALICIOUS

PDF

9.7 KB Created: 2010-02-05 17:01:57 Authoring application: qrOJVDHApvwgFCRwXst (via SHXJYqLCCLSVChbQgMVb)

MD5: accac5c27c38447e87b096abaf1ac552 SHA-1: e28ee81ea11779d41e20ab09a7ab60a64b2f15ff SHA-256: 9bb60d26d998a09a5fd532194e4a9019cf17297f924c4f5104b909701c9c4557

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged as malicious by a machine learning classifier and ClamAV with the signature Pdf.Exploit.Agent-35572. Heuristics indicate the presence of embedded JavaScript, including the use of String.fromCharCode, which is often used for obfuscation. The ML classifier's high confidence score and the ClamAV detection strongly suggest this PDF exploits a vulnerability to execute arbitrary code, likely a second-stage payload. No specific family could be identified.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Exploit.Agent-35572 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35572
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `8b787736567a6b5a05825a42112c5cca3457c05eec2807c701d1aa28d5131c67`	pdf-javascript-stream	PDF /JS object 7 at offset 0x52C	7857 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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