PDF malware analysis — malicious · 9955333cf7b9319b

MALICIOUS

PDF

4.0 KB

MD5: e9dbddc2c3df7fa7b0253bdb03a8f8d1 SHA-1: b9362bc55d37b89ca041ee3ca49362bfb3c7f9de SHA-256: 9955333cf7b9319b79a00ecdcb947d7838b44ca97fb8ec9fccae61fcfea92d65

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The 'eval()' and 'String.fromCharCode()' calls within the JavaScript streams suggest obfuscated code execution, a common technique for downloading and executing further malicious payloads. The ML classifier also strongly flagged this PDF as malicious. Due to the obfuscation and lack of specific indicators for a known family, the family is classified as unknown.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111611_000.js` `aea22fe91a82c54520f249076d3d28893f6e526e6f77887d6439e8e9a4b8e347`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	258 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `3a9cfaf78c2caab8c08e899f44006ec393e3358d376e1ba5fb4a7b9d3ad216e1`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x268	5578 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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