Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4d8b71e6e6f0cc…

MALICIOUS

PDF

19.0 KB
MD5: 17edbcc8a87651aeca67065f7a220de8 SHA-1: 68903e5416d42f60bafd941ce12265d9ebcca61c SHA-256: 6b4d8b71e6e6f0cc9fe0fed4f405cb0629ed75426a5a05bec2878ac5190f2d0a
118 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains an embedded script payload and an embedded file, indicating it is designed to exploit vulnerabilities and deliver a secondary payload. The presence of XFA forms and embedded scripts suggests a client-side execution attack, likely delivered via spearphishing.

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
49385cea23682a6af254176a11e8dcee23834a24f3c925dd431cb6b87cccaba5		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18703 bytes

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