PDF malware analysis — malicious · 35a4aaba2be3f428

MALICIOUS

PDF

118.8 KB

MD5: 25af24ceb4c9bea09a784380a0580821 SHA-1: 86c5a6336f7998149bbbc246aeb3209795f966da SHA-256: 35a4aaba2be3f428fdb024c47b9212e662922803d7e37bd6591a815519e89443

204 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1140 Deobfuscate/Decode Files or Information

The PDF file contains embedded JavaScript, identified by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The critical ClamAV detection 'Pdf.Exploit.Agent-36086' strongly suggests malicious intent. The JavaScript stream, particularly the 'Large comment-padded JavaScript eval stager', indicates a sophisticated attempt to obfuscate malicious code, likely for downloading and executing a secondary payload. The extracted artifact 'javascript_obj0006_000.js' further supports the presence of complex, potentially malicious JavaScript.

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.
Suspicious extracted artifact high 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.
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)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `b739ea42fe825166797c1d1db9e279963252b983a5e4514277d0ee763b57d5d6`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627449 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 9 shell/COM execution token(s). Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 42 long base64-like blob(s).

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