Without knowing something of the structure of the PF, there is no good way to answer.
Is it a “flat” PF, i.e., does it consist of records with a single field that is defined as characters? Or is it multiple fields with various data types? If it’s a “flat” PF, why isn’t it in an IFS streamfile instead of in a PF?
If it’s not “flat”, you’ll have to make it flat before you transfer it. Copying it to the IFS with the appropriate CPY* command is probably a good first step. You can also convert it to UTF-8 at that time. Even if it is a “flat” PF, making a copy in the IFS will be useful in order to have the appropriate UTF-8 encoding.
Once it’s in a streamfile with the appropriate CCSID (1208), you can simply FTP the streamfile to the AIX system.