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Like many of you, I always thought of PDF as basically a benign format, where the author lays out some text and graphics, and then the PDF sits in front of the reader and doesn't do anything. I heard offhand about vulnerabilities in Adobe Reader years ago, but didn't think too much about why or how they might exist.
If you open a PDF file like this one in Chrome, it will run the scripts. There's a catch, though. Scripts can supposedly do things like make arbitrary database connections , detect attached monitors , import external resources , and manipulate 3D objects.
So we have this strange situation in Chrome: It might be possible to embed a C compiler into a PDF by compiling it to JS with Emscripten , for example, but then your C compiler has to take input through a plain-text form field and spit its output back through a form field. I'm not sure why Chrome even bothered to expose the JS runtime.
Chrome also uses the same runtime it does in the browser, even though it doesn't expose any browser APIs. That means you can use ES6 features like double-arrow functions and Proxies, as far as I can tell.
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It now forces downloading.
Mozilla is attempting to make Firefox more secure by reducing opportunities for browser fingerprinting.
Plugin inspection is a core component of many browser fingerprinting techniques. However, many well-intentioned scripts such as PDFObject query navigator.
See the Examples section below for more examples. Default behavior: the full-browser embed If you don't specify a target element, PDFObject will default to document.Moon PDF Viewer.
These activities can increase your level in a forum: Edit Answer for another minute. Most PDF readers support the page parameter, but not much else.
You signed out in another tab or window. Report abuse in forum? Chrome also uses the same runtime it does in the browser, even though it doesn't expose any browser APIs.
See Examples for specific code examples and functioning demos. The completed extension can be downloaded here.