PGP command line decrypt adding characters to file name

I am attempting to decrypt a file from a vendor with pgp command line 10.3.1.  The file contents decrypt correctly but the filename has a bunch of characters inserted into it as so:

/opt/pgp/bin/pgp --decrypt Hires-09112014.csv.pgp --passphrase "<passphrase>"

Hires-09112014.csv.pgp:decrypt (3177:message signed by key ID 0x8804DC89)

Hires-09112014.csv.pgp:decrypt (3038:signing key 0x8804DC89 <keyname>)

Hires-09112014.csv.pgp:decrypt (3040:signature created 2014-09-11T21:01:55-06:00)

Hires-09112014.csv.pgp:decrypt (3170:signature hash SHA-1)

Hires-09112014.csv.pgp:decrypt (3035:good signature)

Hires-09112014.csv.pgp:decrypt (0:output file Hires-091120146091629339472297112.csv)

So Hires-09112014.csv.pgp becomes Hires-091120146091629339472297112.csv when decrypted, no idea why.  Can someone explain how to fix?