As per CB, I think this is close to what you want.

#!/usr/bin/perl -w
use strict;

use File::Copy;

my $source_dir = "C:/temp";
my $dest_dir   = "C:/temp2";

move_pdf($source_dir, $dest_dir);

sub move_pdf
{
   my ($src_path, $dest_path) = @_;
   opendir (SOURCE_DIR, $src_path)  or die "can't open sourcedir";
   if (!-e $dest_path)
   {
      mkdir $dest_path or die "can't create $dest_path";
   }

   my @pdf2copy = grep{/\.pdf$/} readdir SOURCE_DIR;
   
   foreach my $file (@pdf2copy)
   {
      copy ( "$src_path/$file", "$dest_path/$file")
          || die "copy failed $src_path/$file, $dest_path/$file";
   
   }
}
[download]

Update: I think that "move" instead of "copy" above is right for you.