That is to say you should trust people enough to be sure there is no malware in a teacher's PDF and in downloadable books. So I would simply tcheck the PDF before opening it. If the file is an executable, nothing prevents someone from specifying a PDF icon to an executable and mimick a PDF. We are so used to the icons that we see that you will often launch a PDF without looking at the extension or info about the file. Where it becomes a security risk is the icon.
I think you can say that PDFs are secure. If it was that easy to just run some JavaScript in a browser and put some malware in the computer, every website you visit would be a security risk. I use Firefox because it is open source but not for PDFs (unless you are on Linux). Firefox simply didn't implement the whole PDF specification. I would not use Firefox but Adobe to open PDF files. There is a very few amount of security risks if not none in the applications used to open PDFs. The PDF is just bytes in a certain format. I can say there is no way for a PDF to run malware by itself. Then again, keeping my passwords, financial account etc. Would these be secure? The first one seems very unconvenient, since I use my laptop mainly for university and being able to open textbooks comfortably would be good. I read about dedicated virtual machines or using Firefox with disabled JS. So my question(s) would be: Based on this experience, is disabling JS in Foxit doing any good and what would be other good solutions for opening PDF files safely? Now this makes me wonder if disabling JS is any good against potential malware in a PDF and if I should use a different reader or an entirely different solution. However, if I just click "Cancel" or simply close this window, the checkbox remains checked and I can simply save the changes. It then gives me the possibilities to add the file to a privileged location or to enable JS again.
Everytime I checked a checkbox, a window opened, saying that JS is disabled and was used for some features in the document. Today I disabled JavaScript in my Foxit Reader settings because I hope to gain better security against malware embedded in PDF books I read.Īs some sort of simple check I tried to open a PDF with fill-in forms and see what happens when I try to fill-in some of the fields and check some checkboxes.
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