"CorkaMIX.exe is simultaneously a valid:
* Windows Portable Executable binary
* Adobe Reader PDF document
* Oracle Java JAR (a CLASS inside a ZIP)/Python script
* HTML page"
It serves no purpose, except proving that files format not starting at offset 0 are a bad idea.
Many files (known as polyglot) already combines various langages in one file, however it's most of the time at source level, not binary level.