Stubmler is an alias to a Linux trojan which is known as Typot.The description of Typot is available at https://www.f-secure.com/v-descs/typot.shtml
Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.
More scanning & removal options
More information on the scanning and removal options available in your F-Secure product can be found in the Help Center.
You may also refer to the Knowledge Base on the F-Secure Community site for more information.