PDF malware analysis — malicious · a65e44d0304df3a9

MALICIOUS

PDF

15.5 KB

MD5: dbd6be86c2b7f964717fa06041e7af9e SHA-1: 54d95afce1739fd0ac50b703de08f33fe81a418b SHA-256: a65e44d0304df3a93ed7ccd801f4f69d7f41b8553378b336805747af4df96f13

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly indicates maliciousness. The deobfuscated JavaScript stream (legacy_pdfkit_stage_000.js) likely contains code to download and execute a second-stage payload, as suggested by the PDF_EVAL and PDF_FROMCHARCODE firings. The specific URLs or commands are not directly reconstructible from the provided evidence, but the presence of obfuscated JavaScript points to a downloader or dropper functionality.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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_obj0004_000.js` `92429373384456fbad098ad63ce66d166d906990021c66d2df304b151b1648ba`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	303 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `3799aee6114edc7b898c71ccf0cb8487390b51ce561b48c22b6f7188ee58ca7e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1A17	11758 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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