Illustrator crashing when I open a specific file on iPad

Where were you saving the Illustrator file (Adobe's cloud storage, Dropbox or an iCloud folder)? If you have access to a desktop computer (it doesn't matter if it's a Mac or Windows PC) you might be able to log into your Creative Cloud account, download the file locally on that computer and even open the Illustrator file on that computer. If you have a full CC membership you can install CC apps on up to two computers as well as a mobile device like an iPad. For the two computers limit I don't think both can be plugged into the same network; it's more of an arrangement to enable use on something like a work desktop computer and then something else like a portable notebook. Anyway, I would recommend downloading the file on another computer and opening the Illustrator file on that other computer to make sure the document is not corrupted. If the file opens successfully on another computer it will be easier to troubleshoot the elements in the file that could be making your iPad crash.