Changing page variable to in-memory stream

[phutelmyer]

Describe the change
A reference to the "data" variable caused issues with pdfminer while attempting to extract text from a PDF. This error would only occur when the user sets "extract_text" to True from the ScanPdf options in backend.yml. To fix this, we are instead replacing "data" with "pdf_io", an in-memory stream of the data object. This is readable by pdfminer, whereas the data object was not.

Describe testing procedures
Change was made on a local instance. No errors were observed after making the change, and the error that appeared previously was removed. Logging was used to examine the output, which displays proper text extraction.

Sample output
Text extraction noted in header.header:

"scan": { "entropy": { "elapsed": 0.000155, "entropy": 4.953766942682617 }, "hash": { "elapsed": 0.000296, "md5": "039f829a06d43589415673da5ec04431", "sha1": "05b0afac91db59a9de83a2d8b9886586dd76e383", "sha256": "d42488f5ff2444ce075f19c89751ab8f092d9d31c6bae7643b10f3a9550fd5ac", "ssdeep": "192:8lsOIwGOp0/KydxQYBfluX/NtVuvpAyO0aAszFVtLuWNg:8lsOIwGdXDubylzaAs1Lucg" }, "header": { "elapsed": 0.000124, "header": "he pdf995 suite of products - Pdf995, PdfEdit995, " }, "url": { "elapsed": 0.003095, "urls": [ "www.pdf995.com", "http://www.wired.com/\",whichisnothuman-centereddata.In" ] }, "yara": { "elapsed": 0.000207, "flags": [ "compiling_error" ] }

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of and tested my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings