PDF malware analysis — malicious · fce4f5fb58759ea0

MALICIOUS

PDF

118.8 KB

MD5: ae8dbaa9926e38c8a1b90b8e289e294e SHA-1: 2cbcd6d00d61097fd79cda1564284b2989ef46f2 SHA-256: fce4f5fb58759ea09dce8ede8ef11c23d21c902f6e852edc49e56a91db0060af

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The file is identified as a malicious PDF by ClamAV (Pdf.Exploit.Agent-36086). Static analysis revealed embedded JavaScript with high-confidence heuristics for eval() calls and a comment-padded eval stager. These indicate the script is designed to deobfuscate and execute arbitrary code, a common technique for downloading and running second-stage malware. The presence of JavaScript actions and embedded JS streams further supports this attack pattern.

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` `54979ffbcace8951d3173a493ad73435488150e86e1601c85913714e7f8c67e5`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	628018 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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