PDF / .VXE malware analysis — malicious · 6894564f5da910ce

MALICIOUS

PDF / .VXE

2.4 KB

MD5: 4ef32f7eca479011889bb45412af1398 SHA-1: b46dd1d05cf55d08d6fd386768885227a12642dc SHA-256: 6894564f5da910ced3ea785319644e71c8fc2772f1303ea71292c4e5a3d95503

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF sample contains embedded JavaScript streams that are heavily obfuscated. Heuristics indicate the use of eval() and String.fromCharCode, common in PDF exploits. The ML classifier strongly flags this PDF as malicious. The embedded scripts likely download and execute a second-stage payload, leveraging the PDF JavaScript exploit cluster.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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_obj111711_000.js` `fe1fa3ae7bd96aff7e06b7a2e648d3c29e686ce032cf11f0e1014827bcc90af9`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	2472 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`javascript_obj111712_001.js` `1c8359d0133e001a356d550666b6ba468d3435c0450f4176adbfffe94a8e5b37`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x7DD	500 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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