PDF malware analysis — malicious · 08ae74dd86007139

MALICIOUS

PDF

21.2 KB Created: 2010-11-23 54:61:00 Authoring application: String.fromCharCode

MD5: 664c439b49ac0c263fc74b59143c63f9 SHA-1: d081c2bf5272e39b8e9f78f7e742fcd4f865a7d1 SHA-256: 08ae74dd86007139e4d64d9bdfa60c5ae4b34dee719281081fea3dd029d97915

114 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that is obfuscated but appears to be designed to exploit a vulnerability. The script attempts to construct and execute a payload, likely a downloader, based on its structure and the use of 'Function' to execute code. The ML classifier strongly indicates maliciousness, and the PDF JavaScript exploit cluster firing further supports this.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `d56120de8d41ad4678aa89fbe030cd7c9e0dac020c8da1c1d173b034860e5925`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	593 bytes

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