Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f3dc072da53354…

MALICIOUS

PDF

19.2 KB
MD5: bc907e9959d05ebf2acbff941789a720 SHA-1: ebcc9e65c200459678f900a55d5eb93f18c7f147 SHA-256: b6f3dc072da5335426afd13da3d65b5ee7016e11714f6cda71493313553af8f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File T1566.002 Phishing: Spearphishing Attachment

The critical ClamAV detection 'Pdf.Exploit.Dropped-78' and the high ML classifier score strongly indicate malicious intent. The PDF contains an embedded script payload, suggesting it is designed to exploit a vulnerability upon opening and subsequently drop or execute further malicious content. The presence of XFA form elements and embedded files are common characteristics of weaponized PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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
  • 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
f0a46d8bda789c017a331b5c85a5e7bcc8375c60097eb22d6c067aee7592f3fc
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18949 bytes