PDF malware analysis — malicious · 322d2a6f92e91ef5

MALICIOUS

PDF

2.3 KB

MD5: 18b94983ab3678488c4a798e187e1623 SHA-1: 97fc9ca595f3b9a9f16672f3a39f3fb6958c5cab SHA-256: 322d2a6f92e91ef564630f40cb1b5c0ce71dbdf62fd6e1008db8fc15632412ad

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File: User Execution: Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream utilizes eval() and String.fromCharCode(), suggesting obfuscation and dynamic code execution. The ML classifier strongly flags this PDF as malicious. The primary intent appears to be downloading and executing a second-stage payload, as evidenced by the embedded JavaScript artifact. The specific JavaScript file 'javascript_obj0005_000.js' is identified as a suspicious artifact.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `088b62943d1f7607393869570eadfcc4f6c6c3d9fae2ffbe85b59fa7234de94f`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	6834 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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