Try to decompress the file first using upx -d filename.exe .
: PyInstaller often strips the magic number header from these .pyc files. A magic number is a 4-byte signature at the beginning of a .pyc file that tells a decompiler which version of Python was used to generate the bytecode. Without it, decompilers like uncompyle6 or pycdc will fail with an Unknown magic number error. Try to decompress the file first using upx -d filename
When the executable is heavily obfuscated or encrypted, the PyInstaller archive only appears in memory at runtime. This is common with modern malware. Without it, decompilers like uncompyle6 or pycdc will
If the file is not a PyInstaller archive, forcing a PyInstaller extraction tool will never work. You must identify how the binary was built. Use a tool like , Detect It Easy (DIE) , or Exeinfo PE . If the file is not a PyInstaller archive,