Extract attachments from a PDF

Hi

I want to extract attachments from a PDF using a process . I have used the service Operation processFormSubmission of category Forms.

I am getting a error sayin "ALC-DSC-002-000: com.adobe.idp.dsc.RequiredParameterException: Parameter: inPDFDoc is required".

I am failing to find and understand wat is inPDFDoc as i have not used this variable in the process.Can someone please help me regardin this.

Or can anyone suggest me a way how to extract the attachments from the PDF using a process .

Thanks in Advance

Suvidha