PDF malware analysis — malicious · 256fba532965f79d

MALICIOUS

PDF

15.7 KB

MD5: 8cfbeb914a0930398e81dee9579c0dbd SHA-1: c21754e2de8909b807c1d887a4a5a45de9dc6723 SHA-256: 256fba532965f79d36724e427cc44f75fe8a7f127389d6922deec26b05d98dea

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains obfuscated JavaScript, including multiple eval() calls and a large comment-padded JavaScript eval stager. ClamAV detected this as Pdf.Exploit.Agent-36086, indicating a known exploit. The presence of JavaScript actions and embedded JS streams strongly suggests the document is designed to execute malicious code upon opening, likely to download and run a secondary payload.

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` `4fd4f8bfec4a77c0e984cda89ce24ef0c17fa7fbbbab22d1999bc62c5154a88b`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425484 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` `724a63d9b430c4f72044a0fa6de3ddde489c948d303dd79311ab5af5c6da2288`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 481 long base64-like blob(s).

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