PDF malware analysis — malicious · e4b010559c84f2cf

MALICIOUS

PDF

118.6 KB

MD5: 24d1fe68405061c0e1afb458374b190f SHA-1: 9522914f4411b683125ae1078911b5facbae1fb7 SHA-256: e4b010559c84f2cfd64a0bc13b222e9fc593bd64ec77f5ac7a92a9939fd03eee

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious JavaScript

The PDF file contains multiple JavaScript-related heuristics, including eval() calls and a large comment-padded JavaScript eval stager. ClamAV detected this file as Pdf.Exploit.Agent-36086, indicating it's a known exploit. The embedded JavaScript streams, particularly the deobfuscated legacy_pdfkit_stage_000.js, are highly indicative of a stager designed 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` `f4d40bc286d5536e9574044da1b218cc832d5aa29f3df602ba78f0c04a697a74`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626574 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` `e0c409ddb1f9f1dc18847babd85332f8a7d05b5afe1b549031de586be9113765`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 574 long base64-like blob(s).

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