PDF malware analysis — malicious · 5c9181837a788f6a

MALICIOUS

PDF

1.3 KB

MD5: 530102276c345e53a6e796bcf99f6ee4 SHA-1: 05018afe0ec38738e9a56e587c549fb99a5a063e SHA-256: 5c9181837a788f6a4bf9f44f28e1c627216c28a30e2fc8ceba5d696a528eff1f

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript streams that utilize the unescape() function in an obfuscated manner. This pattern is commonly associated with exploiting vulnerabilities in PDF readers to achieve arbitrary code execution. The script's logic appears to be designed to prepare a large string buffer, likely for shellcode or a payload, which is then executed. The ML classifier strongly indicates maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `fc6dd3b75a659eff33d6af7e24ea9c35c0b5db283210e557f3f2e22a67093a02`	pdf-javascript-stream	PDF /JS object 6 at offset 0x167	752 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0006_001.js` `0230031d15748082ca3f527912f98372ad8005fedbc16faae6766dd2732c5538`	pdf-javascript-stream	PDF /JS object 6 at offset 0x18A	976 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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