PDF malware analysis — malicious · cf475c4ccede8646

MALICIOUS

PDF

118.7 KB

MD5: 0a2a10fd03072b8624238ef4a0b964ce SHA-1: 439a6bf38661ead117d9ee039d5ee7679c114d9a SHA-256: cf475c4ccede8646fead2ca1cb436811fefd397c9792e266a9238368ee731804

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1559.001 Component Object Model

The PDF contains embedded JavaScript, including a call to eval() and a large comment-padded eval stager, indicating an attempt to execute malicious code. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly suggests this is an exploit delivery mechanism. The JavaScript is heavily obfuscated, but the presence of eval and fromCharCode points to dynamic code execution, likely to download and run a second-stage payload.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `d1751cd7c8c2727eb7cc7c4784f59f7064dbc6294598a0a63b659e4e930a555f`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627395 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).
`stream_001_off0001d75f.bin` `d923296d1d31199369abd7510b680839295a24a5ad33110dca866ec98685f7a4`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D75F	300 bytes

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