PDF malware analysis — malicious · cbdfcb8f449b62a2

MALICIOUS

PDF

118.6 KB

MD5: 8d450b025a63bd21805cfd3d21bb5d00 SHA-1: 4b7644e0e8e800beb51806b2cbf7eeba46e889ea SHA-256: cbdfcb8f449b62a2ea9b734bebf2d8f86e550e3873b7f8d94fc1183cc5d4ceef

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file exhibits high-confidence heuristic firings for JavaScript execution, including eval() calls and a large comment-padded JavaScript eval stager. ClamAV also detected it as 'Pdf.Exploit.Agent-36086'. The embedded JavaScript stream, despite obfuscation, strongly suggests an intent to download and execute a second-stage payload, a common technique for malware delivery.

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` `687eb81650027de84a547b47b19ef53c220ac0d94125bc6d35caf9a8bdd1f6c7`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627545 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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