PDF malware analysis — malicious · 28462ae7e9dabe96

MALICIOUS

PDF

118.6 KB

MD5: d1dc9c3c3c024d7fcf042b302eeaba4f SHA-1: 8255f4f51e8ecccd5ee2a72d84428cdc695fc7d0 SHA-256: 28462ae7e9dabe96a383d75878293275f7acc0848dab146dd35aaeb338500b50

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript

The PDF contains embedded JavaScript, with multiple heuristics indicating its malicious nature, including eval() calls and a large comment-padded eval stager. ClamAV detection as 'Pdf.Exploit.Agent-36086' strongly suggests it's a known exploit. The JavaScript stream, though large and obfuscated, is the primary mechanism for executing malicious actions, likely downloading and executing 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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `079657562079a2c308dd5d0485d3ba9ecdce2e92d374238c2d9c4180b622a4b9`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627299 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).

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