Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4498611d5d6c462…

MALICIOUS

PDF

19.4 KB
MD5: f89ae344f77608d37e637d73ef8d89d4 SHA-1: 93a68ccde0d3b4c0db10dc6235a0d3bf65a74e15 SHA-256: f4498611d5d6c46220068edaeec92737ebce27770d31ce81a8c6ec0a6de38b37
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 a critical ClamAV detection (Pdf.Exploit.Dropped-78) and a high ML classifier score. The presence of an embedded script payload and an embedded file suggests the PDF is intended to exploit vulnerabilities and download a secondary payload. The document body contains obfuscated JavaScript, further indicating malicious intent.

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
17610d25aa18e31d6fcbb9e5e18abc5838b996f20750284ce630793001e055d2
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 19102 bytes