Yes, Adobe had fixed some security flaws, via Adobe Reader 9.3.4. Hope the following links will help, you gather more information about the security fixes in Adobe Reader 9.3.4:
You can safely download Adobe Reader 9.3.4 through the below mentioned link without any fear of being hacked.
The same goes for Adobe Acrobat 9.3.4 as well.
Many thanks indeed for your help.
OK - I have downloaded it. Thanks very much for your help -excellent reply.