PDF malware analysis — malicious · 4e22a09d58571cfb

MALICIOUS

PDF

15.7 KB

MD5: ebdd935f77e006f304a87dd2fc0d7b6f SHA-1: 576fbc3aa2ffced130be0afcc900dedfb883f4e9 SHA-256: 4e22a09d58571cfb522cc8f4ef7d3c3cd7f0f1e761fd602ee5d44ecc1574e3a4

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF document contains embedded JavaScript, identified by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. A high-confidence heuristic, PDF_JS_LARGE_COMMENT_PADDED_EVAL, indicates a stager designed to obfuscate its malicious intent. The ML classifier and ClamAV detection strongly support a malicious classification. The primary attack pattern involves leveraging JavaScript to execute arbitrary code, likely to download and run a secondary payload, as suggested by the 'Agent' component in the ClamAV detection name.

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` `8b4e66e61981e03720e0f6ce746482ba503143fe5a62ef73acf1a219482c261e`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	424860 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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