There is an entire subculture of l33t l4x0rs who occasionally pop into our world, and as such have to adapt their communication style to match their audience. Sometimes the adaptation is incomplete.

I have appended a file exploit.pl which exploits a vulnerability
in XYZ version N.M.  The result is a denial of service.
The perl script generates a file, which if double-clicked,
results in a crash in XYZ.

S00PrA\/\/e$Um#!/usr/bin/perl

system('cls');
system('color c');
system('title XYZ DOS Exploit');
print('
----------------------------------------------------
****************************************************
*              __                      $           *
*   --        |  |     __             $$$          *
*  |     - -  |__|    |  |           $     | |     *
*   --  | | | |       |__| \  /\  /   $$$  | |     *
*     |  - -  |   r   |  |  \/  \/ e     $  -  m   *
*   --                |  |            $$$          *
*                                      $           *
****************************************************
----------------------------------------------------
');

sleep 2;
system('cls');
print('
----------------------------------------------------
****************************************************
*                                      $           *
*   --                |  |            $$$          *
*     |  - -  |   L   |__|  /\  /\ 6     $  -  w   *
*   --  | | | |__     |  | /  \/  \   $$$  | |     *
*  |     - -  |  |    |__|           $     | |     *
*   --        |__|                    $$$          *
*                                      $           *
****************************************************
----------------------------------------------------

The exploit!
');
sleep 2;

$theexploit = "\0";

open(file, ">exploit.xyz");
print(file $theexploit);

system('cls');
print('
----------------------------------------------------
****************************************************
*              __                      $           *
*   --        |  |     __             $$$          *
*  |     - -  |__|    |  |           $     | |     *
*   --  | | | |       |__| \  /\  /   $$$  | |     *
*     |  - -  |   r   |  |  \/  \/ e     $  -  m   *
*   --                |  |            $$$          *
*                                      $           *
****************************************************
----------------------------------------------------

DONE!

Double-click exploit.xyz in XYZ and KABLOOEEYYY!
');

sleep 3;

system('cls');
print('
----------------------------------------------------
****************************************************
*              __                      $           *
*   --        |  |     __             $$$          *
*  |     - -  |__|    |  |           $     | |     *
*   --  | | | |       |__| \  /\  /   $$$  | |     *
*     |  - -  |   r   |  |  \/  \/ e     $  -  m   *
*   --                |  |            $$$          *
*                                      $           *
****************************************************
----------------------------------------------------

CONSTRUCTED BY S00PrA\/\/e$Um

Special thanks to: XploYtr & T3rM!NaT3R.
');

You may have trouble finding the exploit buried in that perl script, because the perl script consists almost entirely of graffiti and posturing and chest-thumping. (You may also have noticed a bug.) Here is the script with all the fluff removed:

$theexploit = "\0";

open(file, ">exploit.xyz");
print(file $theexploit);

This could've been conveyed in a simple sentence: "Create a one-byte file consisting of a single null byte." But if you did that, then you wouldn't get your chance to put your name up in lights on the screen of a Microsoft security researcher!

(For the record, the issue being reported was not only known, a patch for it had already been issued at the time the report came in. The crash is simply a self-inflicted denial of service with no security consequences. There isn't even any data loss because XYZ can open only one file at a time, so by the time it crashes, all your previous work must already have been saved.)