This site (jobs.utah.gov) seems to require a user login, which I don't have. So I would need some help from you to resolve this issue -
1. Would it be possible for you to send us the PDF file for which Adobe Reader says 'Cannot open - not a valid file'?
2. If not, can you tell us if this PDF file open fine if you access this website on a desktop machine (Windows or Mac)?
Thanks.