Apple has advised the users of all of their mobile devices that run on iOS not to open any PDFs until a fix is released for a flaw which has just been discovered.
Security experts have found that if the flaw was succesfully exploited, it would enable attackers to take control of the devices.
The way in which the Apple iOS 4 deals with PDF files means that if exploited, a user were to be tricked into visiting a website containing a malicious PDF.
Technical director at IT assurance firm NCC Group, Paul Vlissidis, said that discovering a vulnerability at this point is common with new technologies.
"There is always a delay from when they are introduced until new vulnerabilities emerge," he said.
Vlissidis said, "As smartphones become increasingly popular in the market place, more vulnerabilities such as this will come to light, as hacking capabilities become progressively more sophisticated."
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