PDF malware analysis — malicious · 83e8dc5545f428ea

MALICIOUS

PDF

118.6 KB

MD5: e5edab9b9ebbff66c77077e02a5bc42d SHA-1: 63a9dd6c466585aa15638370739888cf496b5ff8 SHA-256: 83e8dc5545f428ea8af6c6358e8fc19d136de8e0a4607cedb38e980a6d26169f

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF contains embedded JavaScript, including a large comment-padded eval stager, indicating it's designed to execute malicious code. The ML classifier and ClamAV detection strongly suggest exploitation. The primary attack pattern involves leveraging JavaScript within the PDF to deliver a malicious payload, as evidenced by the 'eval()' call and the 'String.fromCharCode' usage.

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` `bb68e05bf9e3236966c795f0c15367ccd01e08c6b27693671d960a5d688deafa`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627424 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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