Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebfce7d9040b0f7c…

MALICIOUS

PDF

12.0 KB
MD5: 091adae0986060dfda37716be640c697 SHA-1: ec15900e04d50873f81a847d2ea47684e0b48ef5 SHA-256: ebfce7d9040b0f7c50570e001ee6ab479c3d97d9bc9b9f29f8018eeacade1fb1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File T1566.002 Phishing: Spearphishing Attachment

This PDF file was flagged as malicious by multiple detection engines, including ClamAV which identified it as Pdf.Exploit.Dropped-78. The presence of an embedded script payload and an embedded file strongly suggests that this document is intended to exploit vulnerabilities and download a secondary payload. The ML classifier output of 0.999995 further reinforces the malicious nature of this file.

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
5ce00973fa4cc2e6c45767bfd46c6e0403986544844e4a44ba589644250e2391
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 11499 bytes