added pdf-origami

ruby package and origami gem added to get tools like pdfcop and 
pdfextract

file-analysis.dockerfile

@@ -24,6 +24,7 @@ RUN apt-get update && apt-get install -y \
   python-yara \
   exiftool \
   libreoffice \
+  ruby \
   unzip ; \
   rm -rf /var/lib/apt/lists/*
 
@@ -32,6 +33,7 @@ RUN git clone https://github.com/buffer/libemu.git ; cd libemu ; autoreconf -v -
 RUN pip install pylibemu
 RUN pip install -U https://github.com/decalage2/ViperMonkey/archive/master.zip
 RUN pip install -U https://github.com/decalage2/oletools/archive/master.zip
+RUN gem install origami
 RUN yes | pip uninstall pyparsing ; pip install pyparsing==2.3.0
 RUN chmod +x /opt/didierstevenssuite/*py
 RUN ln -s /opt/peepdf/peepdf.py /bin/peepdf.py