Download the file and open it in Word or LibreOffice. In LibreOffice, go to Tools > Marcos > Edit Macros. Then, on the left, navigate to weird.docm > Project > Document Objects > ThisDocument. Here, you will see the Python program that prints the string cGljb0NURnttNGNyMHNfcl9kNG5nM3IwdXN9.
Putting the above string into CyberChef and using the magic block produces the flag.