Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e8444c71431145b…

MALICIOUS

PDF

18.8 KB
MD5: cc4a01b3f6ceff325e27fcac2f9702dd SHA-1: feff1bd065b955dbab149550867bcdeb812c6c0b SHA-256: 1e8444c71431145b261540ebd9440c0964c889c8794e2443fbd8eb5a61cb3a99
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1566.002 Phishing: Spearphishing Attachment

The critical ClamAV detection and high ML classifier score strongly indicate malicious intent. The PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic suggests the presence of an embedded script, likely used to exploit vulnerabilities within the PDF reader. The embedded file artifact further supports the payload delivery mechanism. The document body content is obfuscated and does not provide clear user-facing lures.

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 script payload in PDF stream medium 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.
  • 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
  • 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
3d968ff212e4963f9a306aa34c85244ecfd8acd5fc8296c7aa52a7f883578529		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18465 bytes

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