Adobe has released security updates to address vulnerabilities in Adobe Acrobat and Reader. Electronic document transform to an attacking tools are worry in cyber security world so far. The fact is that it is hard to detect such indirect attack. The simple we will know it is easy to evade the defense machanism. A malicious user can pass a `cff` font file to the application to cause a heap-based buffer overflow that can lead to an out-of-bounds write. This can cause the application to crash or overwrite values in the heap. If it overwrite chunk header, corrupt free(), but program doesn’t crash. It will be very dangerous!

Don’t underestimate! Offical URL shown as below:

https://helpx.adobe.com/security/products/acrobat/apsb18-34.html