PDF malware analysis — malicious · bce32d6a9442e12b

MALICIOUS

PDF

118.4 KB

MD5: 4bd468f09e8d2d21cd375d89b7ecdac2 SHA-1: 64645dcd0592e82ce74919d41c2b971a200fb92d SHA-256: bce32d6a9442e12bd821095da34029d6181804f4573bfd9acbbf935f7faa2ad7

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, with multiple heuristics indicating its malicious nature, including `PDF_JAVASCRIPT`, `PDF_JS`, `PDF_EVAL`, and `PDF_JS_LARGE_COMMENT_PADDED_EVAL`. The `CLAMAV_DETECTION` heuristic further confirms its malicious classification as `Pdf.Exploit.Agent-36086`. The presence of a large, obfuscated JavaScript stream suggests it is designed to download and execute a second-stage payload. The extracted artifact `javascript_obj0006_000.js` is a key indicator of this malicious activity.

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36086 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36086
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Large comment-padded JavaScript eval stager high PDF_JS_LARGE_COMMENT_PADDED_EVAL

PDF JavaScript contains a very large stream padded with long random-looking block comments around String.fromCharCode and eval. This is an exploit-kit obfuscation shape used to bury a decoder and recovered stage inside noise, not normal PDF form automation.
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. (matched inside decoded stream)
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_obj0006_000.js` `21bc9d0d7e341d79fd2097f090d1da2897660e8db7dc1afaad38fe5165d5facd`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626887 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 42 long base64-like blob(s).

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