I would guess that your PIC(5) means four or five bytes, at least that matches up somewhat well with your data. If we assume the first four bytes, then unpack 'N', substr $str, 0,4 gives 431:
#!perl
use strict;
use warnings;
my $str = "\0\0\1\o{257}\a\o{344}\0\3\0\0\0s\06\o{002}\o{267}";
my $data1 = unpack "N", substr($str,0,4);
print $data1;
I don't know how to get from the 431 I get to the 425 you get, but maybe the other numbers give a better clue here?
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