PDF malware analysis — malicious · 3486fbd233efc586

MALICIOUS

PDF

118.5 KB

MD5: 5b7a5b0b35696bf98078407f40bee75e SHA-1: 994e5c61d08d8cbbb34d35a1728f906cb6593bfb SHA-256: 3486fbd233efc58611afc4c81626523aca3c59397c4ba0e2ca05cc983c65c29b

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript

The PDF contains embedded JavaScript, including a large, comment-padded eval stager. The presence of eval() and String.fromCharCode() calls, along with ClamAV detecting it as 'Pdf.Exploit.Agent-36086', strongly indicates an exploit attempt. The obfuscated nature of the JavaScript and the large size of the embedded streams suggest it's designed to download and execute a second-stage 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` `97167f256aad727cb19b4c9ee9eab297e71086abf07342bdb9b5886261d9ed72`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627181 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` `44648e304f140e5fd22f8ac4e08b64eb0cd3d0ed88a4a6b4ba3890aed68c4c41`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262136 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 478 long base64-like blob(s).

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