Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66d378439d1124e…

MALICIOUS

PDF

19.3 KB
MD5: 241c8d6d83f2e918c4dcf272c0c50678 SHA-1: c190374465dd39646f34ed40f98deefc285b8555 SHA-256: a66d378439d1124ec578876894eb6e6ba3c38f0ab7d5f89e20a89f864be813cd
128 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as Pdf.Exploit.Dropped-78. It contains an embedded script payload and an embedded file, indicating it is designed to exploit vulnerabilities and drop further malicious content. The presence of XFA form elements and embedded URLs further supports its nature as a malicious document.

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
e45a78295af5088e758663f726f09ace019e7bb9d2c79cb7deb2a179a154b3b4
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 19031 bytes