PDF malware analysis — malicious · 5ef5028b9569a226

MALICIOUS

PDF

9.3 KB Created: 2010-05-18 03:49:48 Authoring application: gUatEi6KVFXk2C (via Es72yyyK)

MD5: cc714b73ebcaa43adc7f35a4a2f386e0 SHA-1: 2c0ce69713e5360ed9feaee189b59360ee5f869f SHA-256: 5ef5028b9569a2264f2a6cb3acf3f0648d795c9d35323c0ee6ce58f50dbcf460

148 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. Heuristics indicate this JavaScript is likely exploiting a known PDF vulnerability (PDF_JS_EXPLOIT_CLUSTER, PDF_EVAL) to achieve code execution. The script's complexity and obfuscation suggest it is designed to download and execute a secondary payload, a common tactic for malware delivery.

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.
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.
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_obj0007_000.js` `506c489f7bdd6ad6ece22abb591a9e3720a4245a7a2b60f1873e8bd23bc5a00e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x242	8060 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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