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A comment on Security Flaws in Adobe Acrobat Reader Allow Gaining Root on macOS Silently. Parent comment
To give a few examples, there is no JavaScript interpreter in Quartz (https://www.adobe.com/devnet/acrobat/javascript.html), nor does it have 3D graphics rendering built in (https://helpx.adobe.com/acrobat/using/displaying-3d-models-p...), or a Flash engine (https://helpx.adobe.com/acrobat/using/flash-player-needed-ac... this has bee removed from the Acrobat install, but used to ship with it)
To support PDFs fully, all of that would have to be implemented on top of Quartz.
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To give a few examples, there is no JavaScript interpreter in Quartz (https://www.adobe.com/devnet/acrobat/javascript.html), nor does it have 3D graphics rendering built in (https://helpx.adobe.com/acrobat/using/displaying-3d-models-p...), or a Flash engine (https://helpx.adobe.com/acrobat/using/flash-player-needed-ac... this has bee removed from the Acrobat install, but used to ship with it)
To support PDFs fully, all of that would have to be implemented on top of Quartz.