The jobs created by reporting services subscriptions have ‘random’ names. Here is some sql that helps you identlfy the subscription and the report.
SELECT Schedule.ScheduleID AS SQLAgent_Job_Name, Subscriptions.Description AS sub_desc, Subscriptions.DeliveryExtension AS sub_delExt,
[Catalog].Name AS ReportName, [Catalog].Path AS ReportPath
FROM ReportSchedule INNER JOIN
Schedule ON ReportSchedule.ScheduleID = Schedule.ScheduleID INNER JOIN
Subscriptions ON ReportSchedule.SubscriptionID = Subscriptions.SubscriptionID INNER JOIN
[Catalog] ON ReportSchedule.ReportID = [Catalog].ItemID AND Subscriptions.Report_OID = [Catalog].ItemID
Thansks to SteveFromOz at Sqlservercentral forums