PDF malware analysis — malicious · 9b17b6ef7a1e14ef

MALICIOUS

PDF

4.4 KB Authoring application: Prawn

MD5: e8b1f13d58fdcf9d02d71027f62882e9 SHA-1: afea2d146e7dce757b7a73c3e3f39f17be101cf4 SHA-256: 9b17b6ef7a1e14ef7554110f16ec677a207b85ca08d82f4de822fabcabe9a24d

90 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 Scripting: JavaScript

The PDF document contains an embedded JavaScript stream that is obfuscated using unescape(). The ML classifier strongly indicates maliciousness. The JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the 'Script obfuscation indicators' heuristic. The file type and embedded script point to a common delivery method for malware.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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_obj0006_000.js` `baa6356a9f522f8403aed2cea9671f5339b1aba07c84709ff253f175dee5537c`	pdf-javascript-stream	PDF /JS object 6 at offset 0x1D6	904 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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