The npm package caldora version 1.0.0 contains malicious code that executes on import when run in a Linux environment with the Windows Subsystem for Linux (WSL) present and NODE_ENV not set to 'production'. It downloads a binary from a third-party file host and writes it as 'vite-native-helper.exe' into the Windows user's Startup folder, enabling persistent execution on the Windows host at next login. The payload is obfuscated by splitting the URL into parts and is dormant in typical developer or CI environments, targeting WSL developer hosts specifically. The package's declared functionality does not require this native helper, indicating malicious intent.