I suppose you need a way to do it from commandline.

I'd pass the path of the binary to the script

./myscript.pl ./somebinary

like this Perl has the path to be called in $ARGV[0] and can capture the exit code and STDOUT and STDERR.

update

try either

my $path = $ARGV[0];
open my $fh, "-|", "$path 2>&1" or die "can't open $path: $!"; 

print ": $_" for <$fh>; # print line by line
close $fh;
[download]

or

my $x= `$path 2>&1`;
print "<<< $x >>>";    # print whole slurp
[download]

the 2>&1 part redirects STDERR to STDOUT.

update

print ": exitcode" , $? >>8; will show the exitcode (see perlvar )

update

all in all a bit fiddly, maybe the modules AnoMonk suggested are more reliable.