Is it possible extract html before the automatically generated pdf, based on the code below?

I use at work an third-party application that, when I click a button, it automatically generates and downloads an pdf file. I would like to know if is it possible to get the file originally in html format other than pdf. Below is the html associated with the button.

By searching the web I realized that the code uses Java JSF and PrimeFaces.

I hope my question is clear. Thank you guys very much and sorry my limited english.

If is it possible, what do I have to learn to achieve this task?

The html code associated with the button (got with firebug):

<a target="_blank" onclick="PrimeFaces.addSubmitParam('listarRelacoesPrevidenciarias',{'listarRelacoesPrevidenciarias:imprimirConsultaExtratoTotal':'listarRelacoesPrevidenciarias:imprimirConsultaExtratoTotal'}).submit('listarRelacoesPrevidenciarias','_blank');return false;" class="ui-commandlink ui-widget secundario" href="#" id="listarRelacoesPrevidenciarias:imprimirConsultaExtratoTotal">Imprimir Extrato</a>