This indicates an attack attempt against a Memory Corruption vulnerability in Amazon Kindle for PC.
The vulnerability is caused by an error when the vulnerable software handles a specially-crafted Mobi file. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application, via a crafted Mobi file.
Amazon Kindle for PC version 1.16.0
System Compromise: Remote attackers could gain control of vulnerable systems.
Upgrade to Amazon Kindle for PC version 1.17.44170