How to insert a pdf or sound clip in a imessage on iPhone?

How do you insert a pdf or sound clip in a imessage on iPhone?

The only possible way to do so requires you to jailbreak your iPhone. Other than that, it is not possible.
Here's the jailbreak method: http://www.cultofmac.com/156303/how-to-send-any-type-of-file-with-imessage-on-your-ios-device-jailbreak/