PDF malware analysis — malicious · a96d8c48dcbcbc93

MALICIOUS

PDF

MD5: 2df2a161a83bfcaab662affbf77646fb SHA-1: ca77ed0a90a73e583561f244568df48a994c0f8b SHA-256: a96d8c48dcbcbc93b0bcf095d48477598391a0fa5be3043aea1579801942c779

96 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 ML classifier strongly flagged this PDF as malicious. The presence of eval() and String.fromCharCode() suggests obfuscated code execution, typical of downloaders or droppers that fetch and run additional malicious content. No specific family could be identified due to the obfuscation.

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_obj0005_000.js` `1836b3dac2769a2e92248102ff02e2117854588052132d05b080572de912dd77`	pdf-javascript-stream	PDF /JS object 5 at offset 0x277	1462 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`stream_001_off0000050e.js` `ef51193cfeb8222804060089b07c897a702305ed462517edab375e062826c7e6`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x50E	121094 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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