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When executing the following command in R from your tutorial

papers <- Corpus(URISource(pdf), readerControl = list(reader=pdfRead))

I get the following error

sh: pdfinfo: command not found
sh: pdftotext: command not found
Error in system2("pdftotext", c(control$text, shQuote(x), "-"), stdout = TRUE) :
error in running command

My pdf object looks like this:

pdf
[1] "arees-informatics-2006-reprint.pdf"
[2] "Borer et al 2009 Bull ESA_Effective Data Management.pdf"
[3] "Fegraus-esa_bulletin_eml_ms_07_2005.pdf"
[4] "Harris_2017_Environ._Res._Lett._12_024012.pdf"
[5] "Heidorn_2008_Shedding Light on the Dark Data in the Long Tail of Science.pdf"
[6] "MORTON_et_al-2008-Global_Change_Biology.pdf"
[7] "Ohara et al 2016_Aligning marine species range data to better serve science and
conservation.pdf"
[8] "peerj-preprints-549.pdf"

and my readPDF function object looks like this:

pdfRead
function (elem, language, id)
{
uri <- processURI(elem$uri)
meta <- pdf_info(uri)
content <- pdf_text(uri)
PlainTextDocument(content, meta$Author, meta$CreationDate,
meta$Subject, meta$Title, basename(elem$uri), language,
meta$Creator)
}
<environment: 0x110bd22a0>