Apple has just released new, updated and not-so-enhanced version of iOS – 4.3.4. This versions adds nothing but fixes the PDF exploit. While Apple does not officially says that this minor update is targeted to break the jailbreak, it does mentions that it fixes the vulnerability towards the maliciously crafted PDF.
This was the same exploit that was used in iPad 2 4.3.3 jailbreak method. So, our suggestion is not to update to the latest version as it will break your jailbreak. I have installed it on my iPad and I do not see any new feature or improvements but, hey now you use your iPad / iPad 2 without malicious PDF ‘destroying’ your iPad (pun intended). Here are the IPSW links: