TYPO3 Core

PDF documents are not indexed anymore with indexed_search. No results are shown. My configuration is WITHOUT using EXT:crawler. Until now the PDF documents were indexed by opening it in the FE, but now it seems not to work (anymore?). PDF files are located in the /fileadmin folder as usual. No restrictions on folder given.

TYPO3 configration:
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EXT:indexed_search
basic.disableFrontendIndexing {disabled}
basic.useCrawlerForExternalFiles {disabled}

TS setup:
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config.index_enable = 1
config.index_externals = 1

Server:
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Linux 2.6.32-504.30.3.el6.x86_64
TYPO3 Version 6.2.17
PHP Version 5.6.18

Modules installed:
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pdftotext and pdfinfo for PDF files
binaries are located in /usr/bin/

PHP settings tried with:
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safe_mode = 0 (deprecated from PHP 5.5)
open_basedir /path/to/web/root:/usr/bin:/tmp:/dev/urandom

also woth such settings nothing happens:
open_basedir disabled