with +400 btc sitting on my laptop i would at least consider to not use terrible OS like iOs or Windows, they are full of holes and possibilities for hackers

if not on cold storage, i would have my btc on a system running qubes os and open each pdf, ppt, etc on a dedicated virtual machine (yes, you can have a disposable virtual machine just to open a pdf)

btw, i'm sorry for what happened to you, damn bastards