Malicious PDF — malware analysis report

Static analysis result for SHA-256 57998927767ac8be…

MALICIOUS

PDF

18.8 KB
MD5: 4c142049757199daa66b1f5d61d23c6e SHA-1: 434360d2ab9041a234350bfa5999ff78bc37fe35 SHA-256: 57998927767ac8be8c920263068ec6d2f39745b3c0db66ede8460c9c72df5613
98 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV with the signature Pdf.Exploit.Dropped-78. Static analysis revealed embedded content, including a script payload within a PDF stream, and XFA form elements. While the document body is not human-readable, the presence of embedded scripts and the ClamAV detection strongly suggest an exploit attempt. The embedded URLs are related to XFA and Adobe, which are common targets for PDF exploits.

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
fe8a3db70740511f6ba4762feae078c434eb2c23d7922cc64f0b289e92b3f93f		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18519 bytes

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