How was this file created?
Keep in mind that pretty much everything on the mainframe is ebcdic (there are a few rare exceptions).
If I'm not wrong this data is represented in EBCDIC format.
It is ebcdic, but maybe not the way you intended.
Somehow, you have data that is showing each byte as 2 bytes - ie this is the hex construction of each byte. Often someone wants to show the hex values of some data, but it is rare to have the hex in 2-byte form as input. . .
From that input, what do you want for "output"? Keep in mind that your output will only be 1/2 as long as the input.