how to solve problem with these (cid: 12) when copying pdf text

New Here ,
Nov 07, 2020

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I'm having trouble extracting text from PDF files. These files are proofs that I am using for my master's research and I really need to extract the text, however when I extract (copy), the characters are strange and a tool that I use (PDFminer) presents several "(cid: 12)"
Can you help me or pass on the contact to someone who can?
I really need it, because this problem is delaying my research.

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Edit and convert PDFs, PDF forms

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Adobe Community Professional ,
Nov 07, 2020

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From what I can read under https://pypi.org/project/pdfminer/ PDFminer is a stand-alone command line tool. In what way Adobe Acrobat Reader is involved in this? 

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New Here ,
Nov 08, 2020

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see these proofs of the link, specifically from the year 2017. If you copy the textual content strange characters appear, PDFMiner shows the (cid :). I would need to know if you can copy the textual content of these tests (from the year 2017). I am extracting the textual content from these tests, which I did not create.

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Most Valuable Participant ,
Nov 08, 2020

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Some PDF files are made in a way that text cannot be extracted, or it extracts wrong. This is not a fault in the extraction software. You will need to review and possibly retype your files. 

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