i think, u got this error due to some error while downloading the file. If this is a binary file, it should better be transferred in the binary mode. Instead of downloading using your browser, you can do an anonymous ftp to ftp.samba.org and find the file there in pub/samba directory. U can ftp it to your machine in binary mode. That may help u.
This file size is actually 6622889 bytes. So, find the size of the tar file that u have downloaded. If it doesnt matches, u certainly had the problem in downloading.

Good Luck..