Apple Preview.app is the default application used in Apple MacOS systems in order to visualize PDF files and does not properly parse PDF files, which leads to memory corruption when opening a malformed file with an invalid size on JBIG2 structure at offset 0x2C1 as in PoC Repro1.pdf or offset 0x2C5 as in PoC Repro2.pdf (both values trigger the same vulnerability).
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/93171/applecoregraphics-memcorrupt.txt
Source: https://packetstormsecurity.com/files/93171/Apple-CoreGraphics-Memory-Corruption.html