PDF malware analysis — malicious · fa3629bdb21d555a

MALICIOUS

PDF

5.8 KB Created: 2008-12-03 13:57:41 UTC

MD5: 3c9cfc9469d274ae9e36dc7c7a3f572c SHA-1: 406a04eeb97d90bbaa33c0b47b47938df994bafd SHA-256: fa3629bdb21d555a073647478956bd09e9675ab9aae23d2df9c7fa90d38910fc

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript stream is obfuscated and utilizes eval() and String.fromCharCode, suggesting it's designed to execute arbitrary code. This is likely intended to download and execute a second-stage payload. No specific malware family could be confidently identified.

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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` `f487a54d267c17fa0b48eee95d3099dd9591ecd751c429dc8707104b52cf625c`	pdf-javascript-stream	PDF /JS object 6 at offset 0xB4	9333 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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