Hi Fabricio,
Thank you for using Syncfusion products.
We have created the PDF viewer angular sample with the Rest Web API controller service, Kindly download the sample and Web API controller service from the below link.
Note: First run the Web API controller service sample and then set the URL of the Web API controller in the serviceUrl property of the PDF viewer control in Typescript file.
We can load the base64 string, byte array and PDF filename which is retrieve from the database into the PDF viewer control in Web API controller side.
If the provided sample is different from your requirement, kindly provide us more specific details that illustrates your exact requirement. It will be helpful for us to analyze more on your requirement and could provide you the better solution.
Regards,
Mohan S