PDF malware analysis — malicious · 322f9ae6d4a70bfb

MALICIOUS

PDF

118.7 KB

MD5: a96582a4a43de84bf3869c38e9199576 SHA-1: 84268ba2cbe0a7bcefb069b96e9e6a07298b1254 SHA-256: 322f9ae6d4a70bfb6b2e3b9eacef6720d0064387790e369b8d43d9bba97380a0

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript

The PDF contains embedded JavaScript, including a large comment-padded eval stager, which is a common technique for obfuscating malicious code. Heuristics indicate the use of eval() and String.fromCharCode, suggesting dynamic code execution. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly indicates a known exploit. The primary function of the embedded JavaScript appears to be downloading and executing a second-stage payload, as indicated by the 'suspicious extracted artifact' heuristic.

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` `4ee02d33228c8808cb4292a73c31578e74d7474207ea074aa39854de579c33e0`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627322 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` `1ae095b2421bfc128b95e0fb5d193c0006790950916b09aed40330d6847ece44`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262116 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 591 long base64-like blob(s).

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