Apple has released iOS 4.3.4, the latest version of its mobile operating system for the iPad, iPad 2, iPhone 3GS, iPhone 4 (GSM) and third- and fourth-generation iPod touch. According to Apple’s release notes, the update fixes a security vulnerability associated with viewing malicious PDF files. Apple’s support article provides additional details noting that the issue is related to handling of TrueType and Type 1 fonts that could allow…