PDF malware analysis — malicious · 9395228fca2e7aa5

MALICIOUS

PDF

15.7 KB

MD5: 241b670e34b25548830d73f055edb8c5 SHA-1: 0ef6d4358a410287dfdc98bad77ea638268247c5 SHA-256: 9395228fca2e7aa59523499553e01138a3737ef2ee5b9c40e4e655ce5ec9ee0a

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF file contains embedded JavaScript, including a high-severity 'eval()' call and a 'Large comment-padded JavaScript eval stager'. ClamAV identifies this as 'Pdf.Exploit.Agent-36086'. The embedded JavaScript is designed to execute arbitrary code, which is characteristic of exploits that download and run further malicious content. The presence of JavaScript actions and streams strongly suggests an attempt to leverage a PDF vulnerability for code execution.

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` `57986002f85e9a67eb6b714d9d7ea3c5fa32ab0fef165325f594cc9e03b4038b`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425730 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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