PDF malware analysis — malicious · efd247e223a48505

MALICIOUS

PDF

15.7 KB

MD5: 56c7189cb82086e7551000c5fe5b7dbb SHA-1: 082562c8d8be41cf691446ada42eb20ffc2d1b78 SHA-256: efd247e223a48505a4a2ac77d4cc7a7cf91bafd4c0968fb35e69c6a05d598290

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious JavaScript

The PDF file contains multiple high-severity heuristic firings related to JavaScript execution, including eval() calls and a large comment-padded JavaScript eval stager. ClamAV also detected it as 'Pdf.Exploit.Agent-36086'. The embedded JavaScript streams, particularly 'legacy_pdfkit_stage_000.js', are indicative of a stager designed to download and execute further malicious content. The document body is unreadable, but the technical indicators strongly suggest a malicious exploit delivery mechanism.

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` `7b649bf0b4bb3423ec315a0b019c1f40263397284fcdb1e7e37077bf819707e2`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425156 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` `13db345b26082553f2f316fbcc26f53d60528be08121f458db3877f4fe7303dd`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 640 long base64-like blob(s).

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