Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec49d2b7931df4fb…

MALICIOUS

PDF

11.8 KB
MD5: f638d12a767c1fa967b2169e5b0ea880 SHA-1: 8f2bf701561bd34d27c3330933c6caadf7a34a84 SHA-256: ec49d2b7931df4fb7237f16c22a51c4da55a8c4858e5c50d79dc88826ecab637
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 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 embedded URLs, while mostly benign or unknown, are part of the PDF 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
aad2f06ec530b2976260ba385ab7082463179f136d265aa181abf20717034446
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11347 bytes