I would recommend that you search or post this question in the actually Migration area here:
am not aware of a conversion tool, but I hope these pointers may be useful How many policies are we looking at? Config from the PA can be exported as an xml All address book entries in PA are global You can easily port them to SRX Then create the policies by hand Take a look at the PA xml config I am sure there is a lot of stuff that can be re-used I hope this helps.
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