PDF malware analysis — malicious · 725517fcfd4aaedf

MALICIOUS

PDF

5.9 KB Authoring application: Piseww (via kdkszsfhjg)

MD5: 25416bd20bb2fd573642b524034c576c SHA-1: ed2740ee39fa4b802b3c2d5c16bc825faeb8d10a SHA-256: 725517fcfd4aaedfa88f1dd5a9fc4df5fbf91da562c518af9034d747a866f346

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript that utilizes eval() and appears to be heavily obfuscated. This JavaScript is likely responsible for downloading and executing a secondary payload, as indicated by the PDF JavaScript exploit cluster heuristic. The ML classifier also strongly suggests maliciousness. No specific family could be identified due to the obfuscation and lack of clear indicators.

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_obj0013_001.js` `536e40bc5cbfa79fd09acb424ed834b126cfbb807e889bdb94ea7030c15b566b`	pdf-javascript-stream	PDF /JS object 13 at offset 0x382	59115 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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