PDF malware analysis — malicious · 5ae55bde520add00

MALICIOUS

PDF

9.9 KB Created: 2010-09-14 04:00:45 Authoring application: U1GPT1el4afq (via Cx6ZVXdqIhakrL)

MD5: dc6bd5dfc70c0e6fd647120aec552f9b SHA-1: 9652e18c49e8b3f27e75a7d5899571103ffdcb9a SHA-256: 5ae55bde520add00f0eeb37221786ef1db4b5a974c01e20a3d7b72f12043e7d7

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that is heavily obfuscated. Heuristics indicate this JavaScript is part of an exploit cluster, likely leveraging a known PDF vulnerability for client execution. The script's purpose appears to be downloading and executing a secondary payload, as suggested by the obfuscated string construction and the ML classifier's high confidence in maliciousness. The file's origin is likely a spearphishing attachment.

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` `449ac62ad9453ec73ed0c47e2fead0bfb9701fb9f8d22dd9cf774a15480bfd8b`	pdf-javascript-stream	PDF /JS object 7 at offset 0x241	8335 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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