PDF malware analysis — malicious · b8cfaadbeb410faa

MALICIOUS

PDF

118.7 KB

MD5: e3a410c4828a613cb0b19f48ca0a9389 SHA-1: be3be8e7597a61d1b3e3f56719257b9be060b46e SHA-256: b8cfaadbeb410faa781eca168ff70dc0a0a1038bc12ec04cbea95f0013ff43bd

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

This PDF file was flagged as malicious by ClamAV (Pdf.Exploit.Agent-36086) and multiple high-severity heuristics indicate the presence of obfuscated JavaScript. Specifically, heuristics like 'PDF_EVAL' and 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' point to the use of JavaScript for exploitation. The embedded JavaScript stream, although large and potentially obfuscated, is the primary mechanism for delivering the malicious payload. The ML classifier also strongly indicated maliciousness.

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` `42786636e60de287c1dc49e4e6ba5496103cc8c2ba02345ca3adf9acbec401c4`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627468 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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