This indicates an attack attempt to exploit a Remote Code Injection vulnerability in GNOME Evince.
The vulnerability is due to an error when the vulnerable software handles a maliciously crafted CBT File. A remote attacker may be able to exploit this to execute arbitrary code within the context of the application.
GNOME Evince version 3.24.0 and prior
System Compromise: Remote attackers can gain control of vulnerable systems.
Refer to the vendor's advisory for updates: