PDF malware analysis — malicious · a03805af997303a9

MALICIOUS

PDF

118.7 KB

MD5: 39bd8d9a28a4df4220f3f1c68af3f4c5 SHA-1: 235af3fe229cfb078e729a9033e4ee087f49829e SHA-256: a03805af997303a9a1f8eabd846b0057a35921ba1ad5c8e446283dda7256fe42

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including a large comment-padded eval stager. This JavaScript is heavily obfuscated and uses `eval()` and `String.fromCharCode()`, indicating it's designed to hide its true functionality. The ClamAV detection `Pdf.Exploit.Agent-36086` strongly suggests this is a known exploit. The primary attack pattern involves leveraging these JavaScript capabilities to download and execute a secondary 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` `48295ddf77359f96515b294ac87ddf14e55d27d1b8cb59babb1d2ef6d164b9aa`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626439 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` `ca35fdb6b6c465761bc5c893d2ba174274cc83c67158f8741d5621f01231f6b6`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 569 long base64-like blob(s).

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