Malicious PDF — malware analysis report

Static analysis result for SHA-256 957c782c1e7b0604…

MALICIOUS

PDF

19.2 KB
MD5: c8f03200a0c9898603df3a6658b7c49d SHA-1: 8ab33330cd9506434a8aa3564b7f3c273f89e02a SHA-256: 957c782c1e7b0604731b180e126c9ac4c7fe3eb92ec608dba2158a624a59a233
126 Risk Score

Malware Insights

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

The file is identified as malicious by multiple high-confidence heuristics, including ML classification and ClamAV detection, specifically flagging it as 'Pdf.Exploit.Dropped-78'. The presence of an embedded script payload and an embedded file further supports its malicious nature. While no specific URLs were flagged as malicious, the overall indicators point to a PDF exploit attempting to drop a secondary payload.

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
168b4260c2ba48a29da7a909678c566336d69bdfc6482c8b26e2221e9ff44102
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18886 bytes