Solved!
Thank you for your responses. Fortunately I didn't need to decrypt the pdf manually or something like that.
What I do was install Mac OS X Mavericks on VirtualBox, download File Juicer, download the PDF again and then extract all of it's content.
It took a lot of time because running mac os in an AMD is really tedious, but worked, so :)
PS: Just in case that someone want to know the video format, according to File Juicer, is MP4.
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