PDF malware analysis — malicious · 5ef373ff96cae0a1

MALICIOUS

PDF

12.8 KB

MD5: beff0ce8e36b74e7ceba3c357a3c8454 SHA-1: dcee6a35a971529245aba4b9a0df00b887f138e2 SHA-256: 5ef373ff96cae0a180c96293c5e6c238a9e200f26309f0eb5a7da57a8a0b3f1c

116 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 heavily obfuscated using character codes. The script appears to be designed to exploit a PDF vulnerability (indicated by PDF_JS_EXPLOIT_CLUSTER) and then download and execute a secondary payload. The ML classifier strongly suggests malicious intent, and the presence of JavaScript points to a common delivery method for malware.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `c09cce6ca3001aa4fc687e7595243eb0dc3da819ff999ce64900fd01e97532b8`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	1162 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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