PDF malware analysis — malicious · 07a61105d1029315

MALICIOUS

PDF

25.1 KB Created: 2011-72-51 03:25:00

MD5: c21e7b00552caf386c0a63a1125df3ae SHA-1: a913afd49d805f9fd5cde3e5711396386421e288 SHA-256: 07a61105d1029315bfb6292934b70ed84d42c73eacbd26ee56d837dbf52d0c54

114 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 string manipulation and function calls to construct and execute code. The script appears to be designed to download and execute a secondary payload, indicated by the ML classifier and exploit cluster heuristics. The obfuscation and use of `String.fromCharCode` suggest an attempt to evade detection.

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` `aafc65e0d88b19ac7da96e202f13d273bdbb82d5de238ec6abc3979fee958c23`	pdf-javascript-stream	PDF /JS object 1 at offset 0x6232	358 bytes

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