Best way to test suspicious PDF files?

I was wondering what the safest way to test suspicious PDF files was. I was also wondering how to qualify a PDF as suspicious. I was using PDFid to scan a PDF and I found it had 1 acroform and 1 openaction. It didn't say it had javascript, but I was reading that acroform can let you use certain javascript.
Does xpdf support javascript? Would it be safe to open a pdf in xpdf assuming it had no libtiff exploit or what have you?
Input would be greatly appreciated.

jnguyen wrote:
You could run qemu-kvm or virtualbox and open the PDF within there. This won't tell you whether a PDF file is dangerous though, unless it does something really obvious (e.g. crash the virtual machine or delete all your files).
You could also try use Mandatory Access Control, such as TOMOYO Linux, AppArmor or SELinux. The advantage of these is that you will also be able to tell if the PDF is doing something suspicious by looking at audit logs, and you also won't have to fire up a virtual machine every time. Disadvantage is that you have to learn how to use these powerful security tools. TOMOYO Linux and AppArmor are much easier to learn than SELinux, but SELinux has a tool specifically designed for sandboxing. TOMOYO Linux 2.3 is also already in the [community] repo (just do pacman -S tomoyo-tools). See the wiki pages for more information:
TOMOYO Linux
AppArmor
SELinux
Ah, cool! I've heard of AppArmor before. SELinux sounds familiar and I'm glad to hear it has a sandbox. Haven't heard of TOMOYO, but I'm excited to learn about it.
Thanks!

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