PDF malware analysis — malicious · 9644687935d32a6b

MALICIOUS

PDF

15.7 KB

MD5: 8f6e198d44a5367ce1e53870d46f4c1e SHA-1: c94198d9e01a66cfa8d36d607b6e33f795d3b1ac SHA-256: 9644687935d32a6b5df90ac961179489cf9fed81c9bf49a64f8a529f4b48d57a

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The presence of 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' and the ClamAV detection 'Pdf.Exploit.Agent-36086' strongly suggest this is an exploit attempting to download and execute a secondary payload. The obfuscated nature of the JavaScript streams, as noted by 'Suspicious extracted artifact', further supports this. No specific family could be identified.

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` `d8ba0c1caebf014f1f216797e4f3b9f17553d9c297a9eebe32fa9e90573bab80`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425361 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` `65421e2be797b5b4df3d66a328c6605f2e3c961fce653e9ab0b17b5fa9f525ba`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 506 long base64-like blob(s).

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