Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc690712459ecf58…

MALICIOUS

PDF

498.2 KB Created: 2017-03-08 09:02:38 Authoring application: Joomla! 1.5 - Open Source Content Management (via TCPDF 2.5.000_PHP4 (http://www.tcpdf.org))
MD5: def5aa6620531583c7df67cd38548636 SHA-1: 8662ecf8576c84666211a86d99a0d3ffb2cdf7a3 SHA-256: dc690712459ecf5883c992668903399834af0d035cb4f40fba1b77db9c208bc1
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file was flagged by multiple high-confidence heuristics, including a critical ClamAV detection for 'Unix.Trojan.PhpBackdoor-9354530-2'. The presence of an 'eval()' call within the PDF structure strongly suggests code execution, likely to load the detected backdoor. While no specific URLs or scripts were extracted, the ClamAV signature and the eval heuristic are sufficient to classify this as a malicious PDF delivering a backdoor.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 3

  • ClamAV: Unix.Trojan.PhpBackdoor-9354530-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Unix.Trojan.PhpBackdoor-9354530-2
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000b910.bin
a5337ef1f5a0dfe4dc8fa6b4f3ef847a53624800b5928a0eeef5b888ceecaabc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB910 264072 bytes

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