Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f25b4f1f75b284…

MALICIOUS

PDF

11.9 KB
MD5: ac3979dc3e2051a8e44d12a795ee5914 SHA-1: 16364bbe2d49de92860b2b2d9859a818ecbf7f47 SHA-256: 22f25b4f1f75b28476da8862c6b8b728ddb5bfee495c3a725548abb09a760c43
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics, including ML classification and ClamAV detection (Pdf.Exploit.Dropped-78). The presence of an embedded script payload and an embedded file suggests it is designed to exploit vulnerabilities and download or execute further malicious content. The embedded URLs, while mostly benign or unknown, are part of the document's structure.

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
521494f83f8cabb23a9cf7b2e9da0952a19eeaafeb6bd5534894421fdcd9aad3
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11382 bytes