The pyext6cc8cd PyPI package version 1.0.0 includes malicious code in its setup.py file that executes an arbitrary shell command during installation. The command is obfuscated as a hex string which decodes to 'open -a Calculator' on macOS and is executed via subprocess.Popen before setuptools.setup() is called. This unconditional execution of code at install time allows arbitrary command execution by anyone installing this package. The package contains no legitimate functionality and uses placeholder metadata, indicating it is a proof-of-concept malicious package. The obfuscation technique is intended to bypass static detection methods that look for literal command strings in setup.py files.

Any user installing pyext6cc8cd version 1.0.0 on macOS will have the arbitrary command 'open -a Calculator' executed on their system during installation. Although the current payload is benign, the technique allows an attacker to run any arbitrary commands with the privileges of the user performing the install, which could lead to compromise, data exfiltration, or system damage if modified. This represents a direct risk of arbitrary code execution during package installation.

No official patch or fix is available for this package version. Users should avoid installing pyext6cc8cd version 1.0.0 from PyPI. Treat this package as untrusted and do not install it. Use trusted sources and verify package integrity before installation. Consider using tools that detect or block packages with install-time code execution. Monitor for updates from PyPI or the package maintainer for any remediation.