I received this PDF file and need to make some changes in the document, is there any great free software available for me to do this?
I use PDF X-Change Viewer. Don't be fooled by the name, it's a viewer and and editor and very good for a free product.
The "normal" answer is: purchase the paid version of Adobe Acrobat.
This will let you edit and delete text, remove graphics, etc.
It is also very useful for pdf markup.
Now that the "real" answer is on the table:
There are some other tools, like the Anybizsoft, Foxit, PDF X-Chante and others.
As far as I know PDF files are generated from other document formats, you should convert the PDF file to a document file of your favorite editor. You should look for a converter online which can accomplish this task for free, and yes... They can be hard to find as many companies profit from people searching for such solution.
Try PDFescape. It's a free online tool.
I use Foxit PDF Editor,it's simple and easy to use...
PDF Buddy is an easy and powerful online PDF editor that lets you edit up to 3 PDFs a month for free.
(Full disclosure I'm a co-founder of PDF Buddy)
you can also try a very good alternative:
PDFzorro - PDF Editor:
here you can edit pdf files online, add text and comment, draw lines or retangles etc..
add, delete, rotate, sort pages, merge any pdf files...
There also exist a Google Chrome-Webstore-App for GoogleDrive and a Android-App for smartphones...