The npm package 'constructor-blocks-mailings' version 35.5.7 contains malicious code that, upon being required, downloads and executes an opaque binary from obfuscated Cloudflare Workers endpoints. This binary is fetched via a covert DNS-TXT base64 fallback channel, saved under disguised filenames in temporary directories, given executable permissions, and executed detached from the main process. The package uses string fragment assembly to evade static detection and does not verify the integrity of the downloaded binary. This behavior constitutes a hostile install-time dropper.