PDF malware analysis — malicious · bd2181cb4dcbf673

MALICIOUS

PDF

118.5 KB

MD5: 3eac256716e75d492b526408720b20c4 SHA-1: 6bc9a22409290ed613b7b2887793fcbe84ff3e84 SHA-256: bd2181cb4dcbf6738c94d4c3f248c7abc14f96eae16dbeb182dc371ba8226f05

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, including a large comment-padded eval stager. This JavaScript is heavily obfuscated and uses String.fromCharCode, indicating an attempt to hide malicious code execution. The ClamAV detection 'Pdf.Exploit.Agent-36086' strongly suggests this is a known exploit. The primary attack pattern involves leveraging JavaScript within the PDF to download and execute further malicious content.

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` `33b397e063b03706b9d6d8b2f68f5950024ebea976179d0ab4861aa737dbcb1f`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627205 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` `824bcba8a6cf4373ae5097b7f58f1925ed272e4b665a9df7e3271ee7fed4792d`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262136 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 660 long base64-like blob(s).

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