Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee71b731329738df…

MALICIOUS

PDF

19.6 KB
MD5: 78089ad3e45f0a5451c0d52e2bccfbfc SHA-1: bd79643532f28bc982e51d2941c46f37bb9f4d65 SHA-256: ee71b731329738df9d74ee796bfa2f99051bc89b6ba913fd572bb0c791c1a09c
98 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ClamAV (Pdf.Exploit.Dropped-78). Static analysis detected an embedded script payload within a PDF stream, indicating an attempt to exploit a vulnerability. The presence of an embedded file further supports the delivery of a malicious payload. The exact nature of the exploit and the dropped payload could not be determined due to the obfuscated nature of the embedded script.

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
d0f1225b7716bf415e8b9537a649f8c5b3e836dd285710e08c1aefec8f85b269		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 19271 bytes

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