PDF malware analysis — malicious · 8cc0399bc0664ebd

MALICIOUS

PDF

118.5 KB

MD5: e339e13013316cce0fea32834e080f3d SHA-1: 75809fc7e96cc2d9c65ed47230da03ddb084c299 SHA-256: 8cc0399bc0664ebd85eac35af22c0e3ce19976de7cbb36bbe25db955bc44544f

196 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF sample was flagged as malicious by multiple high-severity heuristics, including ML classification and ClamAV detection (Pdf.Exploit.Agent-36086). It contains embedded JavaScript with eval() calls and String.fromCharCode, indicating an attempt to obfuscate and execute malicious code. The presence of large, comment-padded JavaScript stagers suggests a complex exploitation chain designed to download and run a secondary payload.

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` `5f7bd0be3d9f6632ad9718ad6a4b6990a58745c6903316d80e797d5a5f0affb5`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626661 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` `ba56c3a0b28db57b16dcd6c29779eae890c0588368346e4c4fa9e911ab2081d6`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 632 long base64-like blob(s).

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