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You don’t need executable permissions to run the file when you prefix it with perl on the command line like that.

$ cat helloperl.pl
print “Hello Cruel Perl\n”;
$ ls -l helloperl.pl
-r——–+ 1 admin staff 28 1 Mar 15:36 helloperl.pl
$ perl helloperl.pl
Hello Cruel Perl
$

You do need it if you are going to be running the file standalone, but that also means adding the first line:

$ cat helloperl.pl
#!/usr/bin/env perl
print “Hello Cruel Perl\n”;
$ chmod +x helloperl.pl
$ ./helloperl.pl