At a first glance it should work.

    open(FIN,"< $full_path") || print "File Not Found"; 
        binmode FIN;
        $buffer = join '', <FIN>;
    close(FIN);
    print $buffer;
[download]

BTW: how 'bout:

open my $fin, '<:raw', $full_path or die WHATEVER;
local \$;  # or use File::Slurp
print <$fin>;
[download]

Update:The following appears to work:

#!/usr/bin/perl -T

use strict;
use warnings;
use CGI ':standard';
use CGI::Carp 'fatalsToBrowser';

print header('application/pdf'), do {
    open my $fh, '<:raw', 'minimal.pdf' or die "D'Oh! $!\n";
    local $\;
    <$fh>;
};

__END__
[download]

(it is temporarily available at http://blazar.perlmonk.org/tmp/minimal.pl)

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.