Malicious PDF — malware analysis report

Static analysis result for SHA-256 315309a19d000a7b…

MALICIOUS

PDF

26.0 KB
MD5: dac02651c7183a423746bd751b4b92c5 SHA-1: ae41c784a1e14defef04fba93dabaebbbff623dd SHA-256: 315309a19d000a7b4df683d6baed3887ad7119b2a3de4f4c86ab240a90394dd2
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature Pdf.Exploit.Dropped-78 and a high ML classifier score. Heuristics indicate an embedded script payload within the PDF stream, suggesting it's designed to exploit vulnerabilities and drop further malicious content. The presence of an embedded file further supports this. No document body text was available for analysis, but the embedded script payload is the primary indicator of malicious intent.

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
4b17524e392f773cc646022368937c8fdc7b0a0839751b4bc4f2a71f8173a5ca		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 25905 bytes

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