![]() ![]() AFAIK, Flash content in PDF is only supported in Acrobat and Adobe Reader. The backbone of rich PDF interactivity and multimedia support, it is also the target of never ending exploits, which really can be that dangerous. But I wouldn't worry too much about that either since previewing libraries usually only need access to page markup, ignore scripts altogether, and are not even equipped to interpret PDF-specific JS.Now, the last part of the picture is Flash content. By previewing I specifically mean rendering its contents, and not merely showing a generic PDF icon with a file name (which does not require accessing file contents). Only the more robust PDF viewers support that, and the most ubiquitous of them, Adobe Reader, specifically protects users from dangerous scenarios by containing JS execution in a sandboxed memory space so the code can only operate on the document itself, not the OS environment or file system.The only potentially risky scenario I can think of is previewing PDFs in your email client or web app. Running scripts requires actually manipulating the document (at least, parsing it's contents) in an environment that can support JS execution for PDF. That does not seem possible.The only danger in PDF is it being able to perform actions coded in JavaScript, some of which can be made malicious. Can I be hacked if I received a PDF from my email but I never pressed/opened the said PDF? flv) and the show/hide field functionality. Of those that immediately come to mind it's probably only video (.mp4, not. There are very few PDF interactivity features that work more or less universally. Not a reliable option anymore… Almost anything that requires JavaScript won't work on mobile. Anything made with Flash or requiring it will only work in Adobe Reader or Acrobat Pro, only on desktop, only with Flash Player installed separately on the destination system. just for printing, you can still use the Fill & Sign tools in Adobe Reader to type over it and place a drawing of a signature.Interactivity. If your PDF looks like a form, but is in fact flat without any fields, e.g. Depending on how the form was created you may need to Reader-enable it in Acrobat so it can be saved or digitally signed. ![]() Those created with Acrobat Pro (acroforms) can be filled in most readers, including on mobile. That's a feature of Acrobat Pro and its other paid rivals.Forms. It will also let you add text with Fill & Sign tool and edit it, but neither it nor other free readers will let you edit and format the text and images already in the file. Adobe Reader will give your students lots of drawing annotations, text editing markup, file attachments and more (some of it will require Reader-enabling in Acrobat first), so it still sounds like the best free option. Most PDF reader apps will let them annotate the file (add comments), but while they all support the basic sticky notes, few go beyond. Depends on what specifically you want your students to do in those PDFs and what do you mean by “write”.Annotations (comments). ![]()
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