Null is

my $justanull = "\x00";
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a little endian 4 byte integer is

$not_ascii = pack('V', 1);
#or
$not_ascii = pack('V', "1");
#$not_ascii should not be printed to console, it looks gibberish as as
+cii
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Perl has absolutely no problems in dealing with binary data aslong as you dont turn on utf8 mode for that scalar. & ^ and | work with "ascii" printable scalar integers, not on bytes or bits. After using &/^/|, you need to use pack to get it into binary. Perl historically is excellent in dealing with binary.

If you really want, you can even write machine code/shellcode in Perl, and run it also from Perl. This guy did it, Pure Perl module(246 lines, Linux/Win32) that calls external libraries - no XS file..