PDF malware analysis — malicious · ee9b4639891a324b

MALICIOUS

PDF

118.7 KB

MD5: a04dce0f55a08182fb4f0385f0a5630f SHA-1: a0fd93c75503a26c20f61753aa1c9dfce3697da1 SHA-256: ee9b4639891a324b5743bdfe12b198ad2a8fb07ec26a14376aeebea7777f9f19

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript, identified by multiple heuristics including `PDF_JAVASCRIPT`, `PDF_JS`, and `PDF_EVAL`. A critical heuristic `PDF_JS_LARGE_COMMENT_PADDED_EVAL` indicates a stager designed to obfuscate and execute JavaScript. ClamAV detection `Pdf.Exploit.Agent-36086` further confirms its malicious nature. The primary function appears to be downloading and executing a secondary payload, though the exact URL or payload is not directly extractable from the provided evidence.

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` `89ff11251ae3e8e70f7a6b48dbfedeaed253bca6248bad63eeee0aa343a70c5a`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627606 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).
`stream_001_off0001d723.bin` `860491b84876fe5f02fd3fac531b92e84f4e9e2ee19af3053e28115063c2535c`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D723	300 bytes

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