PDF malware analysis — malicious · b05f13ff87559f99

MALICIOUS

PDF

63.9 KB Created: 2010-11-13 13:52:29

MD5: 4c7758ba4c159432160e151cfd47148e SHA-1: 7453a1f23bb5ae36ccd025dc7f535fc28d688e9a SHA-256: b05f13ff87559f993951d6e1d352e76183d0f025fd84ba71baf31bb4ba03c756

194 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded JavaScript and utilizes XFA form elements, which are known vectors for exploitation. The ML classifier strongly indicates maliciousness. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, although the exact mechanism is obfuscated. The presence of XFA and JavaScript exploitation signals a high likelihood of a malicious PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 7

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.
Correlated malicious PDF JavaScript signals critical PDF_CORRELATED_MALICIOUS_JS

PDF JavaScript or auto-action content is corroborated by exploit staging, ML, or suspicious extracted-artifact findings. This correlation promotes old exploit-kit PDFs that otherwise remain in the suspicious band because each individual signal is intentionally weighted conservatively.
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/2.6/
- http://www.xfa.org/schema/xfa-template/2.6/

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