Malicious PDF — malware analysis report

Static analysis result for SHA-256 10916c695902191d…

MALICIOUS

PDF

19.3 KB
MD5: 2b90d131136ed754f0bc0df1a0ce81e0 SHA-1: 15d5189235d1aaf37273398af34292a11417f9f2 SHA-256: 10916c695902191d5d7486c01e9b480acc835bbadc47be4e2a62b0030ba7f9af
118 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains an embedded script payload and an embedded file, suggesting it's designed to exploit vulnerabilities and download a secondary payload. The presence of XFA form elements and embedded scripts points 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
a16756610c6bedbc79caa2869eb9e209ccb691c6c695150c4af445036ee75a8f		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 19031 bytes

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