PDF malware analysis — malicious · 322c34d74ed4e1cd

MALICIOUS

PDF

118.6 KB

MD5: e20ae38ae203f69b80b0854df347cd4b SHA-1: 512b941c81729aef55b57fc6b7733eadca785813 SHA-256: 322c34d74ed4e1cd9a2d0bb89f6a68f9fc97b160dc007a6ccdc68de8dd56eca2

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF contains embedded JavaScript, including a large comment-padded eval stager and multiple eval() calls, indicating it's designed to execute arbitrary code. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly suggests an exploit attempt. The ML classifier also flagged it with very high confidence. The document body was unreadable, but the heuristics and ClamAV signature point to a malicious exploit delivery mechanism.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `65ffd64844999a7ddd0bb8c57649d2b7325ed2f5ebca89e2c224307260b38e3b`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627109 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).

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