Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1434f548eeba09…

MALICIOUS

PDF

18.8 KB
MD5: fcbd44a4f6f1c44100c43617e4ca99cf SHA-1: cd98f82085a86613424dfde44913760ff4b80beb SHA-256: 6f1434f548eeba095ae782f880d51850fc9dd234e1431739a61e808e97cb07e5
118 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating it contains exploit code. The presence of an embedded script payload and an embedded file suggests it is designed to download and execute a secondary payload. The XFA form and embedded script point towards exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Embedded script payload in PDF stream low PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/xdp/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
db3ac831069170205994a61ee4c672ef6a3113455d5c1ef8d95ec8f0457d716b		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18470 bytes

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