Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f3c385ac264e2b…

MALICIOUS

PDF

18.9 KB
MD5: 8313e90b4a90c32fc12857cfcfabbce9 SHA-1: 252d26d44055effa429fa47400ced638d8d39d03 SHA-256: b9f3c385ac264e2be884664934f0a05ad10469f4becd04b5df53fb7553c3d7c6
98 Risk Score

Malware Insights

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

The PDF file contains an embedded script payload, as indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic. ClamAV also detected it as 'Pdf.Exploit.Dropped-78', suggesting it exploits known PDF vulnerabilities. The embedded file and script are likely used to download and execute a second-stage payload. The presence of XFA forms and embedded files points to a complex attack vector.

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
9b4444614c256ba0c17ed7a97a120a65d05ca3bf25469dfff8bebc1bdd6ff04f		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18556 bytes

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