PDF malware analysis — malicious · 65a95154e7dba234

MALICIOUS

PDF

3.9 KB

MD5: b3da5aaab39388f5a5b1b9c760f8b10d SHA-1: 4ed5b0d805b3113b55bf312f4ebb992b47d06822 SHA-256: 65a95154e7dba234db9deb34e62ec5fbafbcbd65c1a9204870c7302c71ef86c9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript streams, one of which utilizes an eval() call to execute obfuscated code. This script is designed to download and execute a second-stage payload, as indicated by the 'PDF_JS_EXPLOIT_CLUSTER' heuristic. The ML classifier strongly flags this PDF as malicious. No specific family could be identified.

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_obj111611_000.js` `8a4293d5836d53838eaa2e1708b968504234aa08ff6c9dae670806426fd4d714`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	258 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `cce665c34f57a714bc5e0a428871e48ddabf21c3f10cf07d2d454ea870a7060a`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x268	5614 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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