PDF malware analysis — malicious · 49e450c49bd47945

MALICIOUS

PDF

118.7 KB

MD5: 351be764f3a6de48db0ef2743fb11f63 SHA-1: 96376cf4c4c95503b8cf5084565f1c2f533cec41 SHA-256: 49e450c49bd479455896ccb82b4e9d38eeee83bbccea2ae386227fdca677f1fd

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, including obfuscated code with eval() calls and String.fromCharCode, indicative of a stager. The ClamAV heuristic 'Pdf.Exploit.Agent-36086' strongly suggests this is an exploit document. The presence of large, deobfuscated JavaScript streams further supports the exploitation vector. The exact payload or target is not discernible from the provided evidence.

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` `a067575a9aae4ba04c29e9a286d3ff94867fc15582942b611257f3bfb1382e0e`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627509 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).
`legacy_pdfkit_stage_000.js` `5f681d28ec62a7e179bc9caf709a22e3bcea0564cac3313781af8777abb94baa`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 621 long base64-like blob(s).

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