Nitroreport PDF module for Moodle is a module, which allows to generate reports in PDF and XLS, XLSX and ZIP files with the data from the quiz attempts by users. The plugin is still under development and is available from the GitHub page of the author Jarosław Maciejewski.
Currently it works with Moodle 2.9 only and supports all common question types available for Moodle. Here is a small presentation created by the Module author about the NitroReportPDF module and its basic usage.
Here is small post by author about the detailed process of installation, support and license terms.