Malicious PDF — malware analysis report

Static analysis result for SHA-256 217dd1857162833b…

MALICIOUS

PDF

26.0 KB
MD5: 77e898829865bf69d91daed5fecb9ea3 SHA-1: e94a43b23f1f6836c109d0d480aa7a15dc48a0b9 SHA-256: 217dd1857162833bcdef14502642832734f664b7e483ed3d289b0ea398c21b31
98 Risk Score

Malware Insights

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

The PDF file contains an embedded script payload, indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic. ClamAV also detected this file as 'Pdf.Exploit.Dropped-78', suggesting it exploits a known PDF vulnerability. The embedded script likely downloads and executes a second-stage payload, although the script content is heavily obfuscated and difficult to parse directly. The presence of XFA form elements and embedded files further supports the malicious nature of the document.

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
8ddd25f4823764fdee5aa5bc7397430c947634eb27af64b0aa77cbde3685c6fd		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 25909 bytes

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