Virtual learning environments are commonly adopted by universities
as classroom teaching support. One of the resources they offer
are class presentations, usually in PDF files. Considering that web
accessibility is essential to allow users with some limitations to
understand, interact, operate and navigate web content, this article
presents an assessment of the accessibility of PDF documents made
available on Moodle. The methodology used a hybrid approach
comprised techniques and practices for assessing human-computer
interaction and assessing accessibility with users simulating blindness.
A quantitative analysis of the data was carried out considering
the accessibility problems faced by users in elements such as tables,
graphs, mathematical formulas, expressions in foreign languages
and presentation topics. The results indicated accessibility problems
in all documents in the sample, even causing users to drop out
during the evaluations.