PDF malware analysis — malicious · 310a48219aedd227

MALICIOUS

PDF

4.3 KB

MD5: e0fa3601f0e853604339a9b63fa23a9e SHA-1: 360c4cf6e63dd40eaf613c9575481cc66ed2a6be SHA-256: 310a48219aedd227cc748ce7ff0ba366bfd40e7e61a4fb8852385619bfa9a874

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly indicates maliciousness. The embedded JavaScript, named 'javascript_obj395487_000.js', is likely responsible for downloading and executing a second-stage payload, a common technique for initial access. The specific obfuscation and eval() calls within the script prevent a more detailed analysis of its exact actions.

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_obj395487_000.js` `b51731046252c46e728daa13718a0844d61423b29b20e6a6a54887353ba93e1f`	pdf-javascript-stream	PDF /JS object 395487 at offset 0x137	8313 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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