Good idea
If you don't know what arivero is referring to, check out this iLiad thread:
https://www.mobileread.com/forums/showthread.php?t=7063
and here:
https://www.mobileread.com/forums/sho...&postcount=250
Basically specially-prepared PDF files may allow you to run any external application. This worked well to hack an older iLiad firmware.