printf "%0x\n", $_ for unpack 'V2', "\x45\xd2\xff\x76\x89\x3a\x00\x33";;
76ffd245
33003a89

#or 

printf "%0x\n", $_ for unpack 'L<2', "\x45\xd2\xff\x76\x89\x3a\x00\x33";;
76ffd245
33003a89