The npm package 'checkout-desktop-pay-widget' version 35.6.3 contains malicious code that downloads and executes opaque native binaries from Cloudflare Workers hosts. It uses obfuscation techniques to evade detection, including runtime-assembled hostnames and a DNS-TXT record fallback channel for covert payload retrieval. The package masquerades as a legitimate payment widget but functions as a remote code execution dropper without verifying downloaded payloads.