Ho to get Change Notice Workflow Histroy in PDF file

Hi,

Can somebody please tell me, how can i get the change notice workflow history in pdf file? I am working on WBM task. As WBM doesn't support for migration of workflow history, we are looking for saving the workflow hostory in pdf file and attach it as secondary content. All the contents like activities, tasks, participants, approver, votes, task comments etc as shown in routing history should be captured. There should be one pdf file for one ecn.

Please suggest me some approaches.