PDF malware analysis — malicious · b7ba1136863b56c6

MALICIOUS

PDF

11.4 KB Authoring application: nebus (via var x=id.length;)

MD5: a4bfe8dedee2af65ea839582ab532c51 SHA-1: 29715cb29ef896b29d13fcc44ea2d6c18bf20fd0 SHA-256: b7ba1136863b56c652fb720e304036f1c9ed806cdbfce2e7320a946b982ae2c4

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript file, 'javascript_obj0004_000.js', is likely responsible for executing the malicious payload. The document body contains obfuscated JavaScript-like code, further supporting the presence of scripting.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ClamAV: Pdf.Malware.Agent-9983090-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Malware.Agent-9983090-0
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.
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_obj0004_000.js` `c42e652100bced970a775c127bcfd7678c7edac254064b95d7a41e58742cc302`	pdf-javascript-stream	PDF /JS object 4 at offset 0x2BAA	262 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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