PDF malware analysis — malicious · 0ca009756be3452a

MALICIOUS

PDF

22.5 KB Created: 2010-02-23 13:38:14 Authoring application: Siljeqiwobp (via Jofozawojejipe)

MD5: a1e80b90dc43a257527c05716c50921d SHA-1: ee2f4b9f67a2aaf311ec919e94ac88bcccf520de SHA-256: 0ca009756be3452ac2bf5f48b4e5a883e28a3c66bf44e48f1746c031d9baca53

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript that is heavily obfuscated and utilizes the unescape() function, indicating an attempt to exploit a vulnerability. The ML classifier strongly suggests maliciousness. The JavaScript is likely responsible for downloading and executing a second-stage payload, which is a common technique for malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9989

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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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.
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_obj0034_000.js` `e9d2dddae232e99c62f3388679c3b56bd74886e7e2a3a030b676b33163b85927`	pdf-javascript-stream	PDF /JS object 34 at offset 0x52A4	27828 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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