The npm package 'native-runner' contains malicious code that, upon import, silently waits for and executes a hidden binary named node_runtime_helper.exe from a Windows system-like directory. This behavior occurs as a side effect of requiring the package, without any explicit API call. The package depends on 'img-to-native', which places the malicious binary on the system. This drop-and-execute chain can lead to full system compromise, and removal of the package does not guarantee eradication of the malware.