PDF malware analysis — malicious · 14276f845a6c3297

MALICIOUS

PDF

5.9 KB

MD5: 55978f152dbe45712ac222558f5843d4 SHA-1: 4893def9c6f281905c1146630e54e006fd5d6441 SHA-256: 14276f845a6c3297e17d179eb849c2ce4a0b48cec233cbf3644416f1d2fb0564

148 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains obfuscated JavaScript that utilizes an eval() function, a common technique for executing malicious code. The script is identified as part of a PDF JavaScript exploit cluster, strongly indicating it's designed to exploit vulnerabilities within the PDF reader. The primary function of the script appears to be downloading and executing a secondary payload, as suggested by the ML classifier's high confidence and the nature of the exploit cluster.

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_obj0009_000.js` `48cc32d9aa5eb22b75ab5fc1c0bd2c415ae0e30071531dfb0dffe89e72767adb`	pdf-javascript-stream	PDF /JS object 9 at offset 0xD6	83949 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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