PDF malware analysis — malicious · 15ed30fcac879ad8

MALICIOUS

PDF

829 B

MD5: d80c6e75ea391da18ec3c0536b1fa7ce SHA-1: da74219a3da705a5302234fd56b4e6689dcce67b SHA-256: 15ed30fcac879ad8c4e651fbf1d7df17dea35980422a48a1d23d2ba9cc02b18e

148 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains obfuscated JavaScript that utilizes the unescape function. This script appears to be designed to exploit a known PDF vulnerability, likely for client-side execution of a malicious payload. The ML classifier strongly indicates maliciousness, and the presence of JavaScript points to a common delivery method for malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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.
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_obj0005_000.js` `6528c8aac18680c74a85f0d46bb26e82b95cc654356ce469e95bb280acdecdb5`	pdf-javascript-stream	PDF /JS object 5 at offset 0x156	311 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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