PDF malware analysis — malicious · 4c4e9f0c4c0280a5

MALICIOUS

PDF

118.5 KB

MD5: d6ebcec4d3c598282f887297114fd376 SHA-1: eb563ab26559e9134df998b611373214bbdb1c39 SHA-256: 4c4e9f0c4c0280a598b86837682c86581e2bc59b04756f6e851c6db82a3024ab

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file was flagged by multiple high-severity heuristics, including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_JS_LARGE_COMMENT_PADDED_EVAL, indicating the presence of obfuscated JavaScript. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely acts as a stager to download and execute a second-stage payload, as indicated by the 'eval() call' and 'Large comment-padded JavaScript eval stager' heuristics.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `fb2588e6129f6ba06e4e7633c28a408a77fc69d6f770af3a31a6be508394fae7`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626690 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` `e8971b1c55ce6727c0f140c9ab859ddf393b17daa3f1f8f01da036dde47f2467`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 557 long base64-like blob(s).

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