PDF malware analysis — malicious · ff46805f20c84f3d

MALICIOUS

PDF

118.7 KB

MD5: 816ee130a5a92549180d1a6d70746ae4 SHA-1: 2466ae8908ee1f61eed7ca553183a0cac46265c7 SHA-256: ff46805f20c84f3d0835658d9abdc6ea09246517325a8abbe2a306ca76c01d75

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains multiple embedded JavaScript streams, with high-confidence heuristics indicating the use of eval() and a large comment-padded JavaScript eval stager. ClamAV detection as 'Pdf.Exploit.Agent-36086' further supports its malicious nature. The obfuscated JavaScript likely attempts to download and execute a second-stage payload, a common technique for initial access.

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` `344ccc9931e84bbbf108de82af97b3676cb06c774f290f9f9aebbeae7d5ee4f5`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626759 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` `3a8f9fe7c6076b98a4ab7ca5ff7341cfebb9796fb227e0d64f1cf4c715325620`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 669 long base64-like blob(s).

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