Thank you for contacting Syncfusion support.
At present, we do not have the support for getting the coordinates through each line. However, we can achieve your requirement as a work around. Initially we have to extract the text in the PDF document using layout based text extraction ExtractText(true) and then we have to provide the particular line to the Findtext() to get the coordinates of the line. We have created the simple sample for your reference and shared the same in the following location
Please try the sample and revert us with more details if your requirement is differ from the provided sample.