PDF malware analysis — malicious · 196f5aea4af90dc1

MALICIOUS

PDF

6.2 KB

MD5: e95013c8e10ecaa12df41105704d792a SHA-1: a79e82fa1545c95e2bd46ea7db5c5f3c7575d884 SHA-256: 196f5aea4af90dc110b5cce3b12f4a786dc88d041dacfbd233e38b43d6e2e9da

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript that is designed to exploit vulnerabilities within PDF viewers. The JavaScript is heavily obfuscated but appears to be responsible for downloading and executing a secondary payload. The presence of PDF_JS_EXPLOIT_CLUSTER and ML_NYX_PDF_MALICIOUS heuristics strongly indicates malicious intent, likely delivered via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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.
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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/2.6/
- http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0012_000.js` `768775f13250a1d2585d09dfb9de7cf698384337b40091a74b7bc28b9990d958`	pdf-javascript-stream	PDF /JS object 12 at offset 0x383	4530 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).
`javascript_obj0012_001.js` `a0b6e5122ccf8485230bb16ff6f5ac6c8c806a0174e308d8457625ff67b2765b`	pdf-javascript-stream	PDF /JS object 12 at offset 0x3A5	5415 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).
`legacy_pdfkit_stage_000.js` `31349d60cb9620df64e077622764ad9124171ce7762a0fa0875bfcfed316a978`	deobfuscated-js	split-join delimiter stripped JavaScript at offset 0x3DD	5259 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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