The npm package 'weight2loss' version 1.0.5 contains malicious code in a setup.js file referenced by a postinstall hook. This code, if executed, steals sensitive credentials from the installer environment, exfiltrates them to an attacker-controlled server and email, downloads and executes additional malicious scripts, establishes persistent remote access via a cron job, and deletes itself to evade detection. The postinstall hook is misconfigured and does not auto-run on install in this exact version, but the malicious payload is fully functional if manually invoked or if the manifest is corrected. The package's stated purpose does not align with its malicious behavior.