GCVE-110-OSM-2026-12413

package.json declares a postinstall hook `node index.js`. index.js is a 111KB blob composed exclusively of the JSFuck character set (`[]()!+`), which decodes at runtime via `Function(<decoded string>)()` to arbitrary JavaScript. A sibling file extension.js (126KB) uses the same JSFuck encoding, indicating a multi-stage opaque payload. The package has no description, no author, and no dependencies, and ships no readable source — the JSFuck encoding is exclusively an obfuscation technique used to hide executable code from scanners and reviewers. Installing this package causes automatic execution of the opaque payload on the installer's machine during `npm install`. ENTRY index.js (install-hook: node index.js) - Install Hook Executes Local JS File in package.json ADDITIONAL FINDINGS - Very New NPM Publisher Account