PDF malware analysis — malicious · b4f92a4ef183c13a

MALICIOUS

PDF

13.4 KB Created: 2009-06-16 06:15:20 Authoring application: JfWxoDfzpxxCUa (via vttxfzXKtpjlKn)

MD5: e44badffcebeabd4fcc805bd048d223d SHA-1: 3ba46f1c86a2348945a275669c60bd290e22c4e8 SHA-256: b4f92a4ef183c13aac2af3ced4976008b3071a4beda981c85c0cac9e3637152c

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file is a PDF containing embedded JavaScript, as indicated by multiple heuristic firings and the presence of an embedded JS stream. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically targeting PDF exploits. The embedded JavaScript, though not fully detailed here, is the primary mechanism for exploitation, likely leading to the download and execution of a secondary payload, consistent with the 'Pdf.Exploit.Agent-35572' ClamAV signature.

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` `6524f850b8332be77bad89ee658e56efebafc5514e7ebed57b9e2340e7cf8add`	pdf-javascript-stream	PDF /JS object 7 at offset 0x4E7	11648 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 52 long base64-like blob(s).

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