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I need a shell script to detect valid PDFs. That is, I need to retain only plain ASCII PDFs. Other PDFs which contain non-ASCII contents and malicious scripts need to be deleted. How could I go about doing that? Is there any script available to do it?

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Clarifying question: if the PDF contains only pictures of puppies, do you want to count it as ASCII or not? – James Youngman Apr 8 '12 at 8:29
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What are you trying to achieve, at a high level? A computer can't detect ‘malicious’ scripts. Malice is in intent, and computers can't parse human intent. E.g. deleting a file: did you mean to do it, or was it malicious? Ifa computer could tell what you meant, we'd be using it through mind control. ;) – Alexios Apr 8 '12 at 8:30
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Did you look at this zeltser‌​? – Eli Rosencruft Apr 8 '12 at 8:31
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You mean 'text' or really ASCII? An ü or è would be OK? – Matteo Apr 8 '12 at 8:56
people upload the pdf's via web interface all the uploaded pdf's stored in the directory at some instance some script or malicious files upload via web just rename to .pdf extension.in that case its harmful for server so i need to script which scan the file type of uploaded whether its have valid content or not – user512213 Apr 8 '12 at 8:57
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What you want is called a virus scanner. Eg. ClamAV

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virus scanner scan and remove only known malicious scripts how to remove unknown scripts.is it virus scanner do this operation. – user512213 Apr 9 '12 at 1:48
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How will you differentiate between good or bad? You too will only scan for known attack vectors. Although very broad, in fact you described one of those vectors above 'non-ASCII contents'. – jippie Apr 9 '12 at 8:58

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