PDF malware analysis — malicious · 131e1fe45b12610a

MALICIOUS

PDF

30.2 KB Created: 2009-05-01 21:21:45 Authoring application: ghjkSFghjkCPx (via afdsdgf)

MD5: 7198775189b81e16c9a138adc8fe4ef9 SHA-1: 76bfdaaae5ea6c386d232954ee5b8fb262d2c6de SHA-256: 131e1fe45b12610aa15214ef3b687e92ddbfe9233cf3905757728f3cd3706ebd

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript streams that are heavily obfuscated and utilize eval() calls, indicating an attempt to execute arbitrary code. The ML classifier strongly flags this PDF as malicious. The primary function of the embedded scripts appears to be downloading and executing a second-stage payload, as suggested by the exploit cluster heuristic.

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
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `71f70f0aca4eaacaece4dd8c72a4dd7adfe23ad7faef21035ad372d61c125f3f`	pdf-javascript-stream	PDF /JS object 7 at offset 0x21C	29740 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `4c95223204816c4b5c2e622fa7a0e8f3b7f2aff2d7b8e5dc5c0917eba6b7fcce`	pdf-javascript-stream	PDF /JS object 7 at offset 0x21C	28821 bytes

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