Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1907b55ef0aac99…

MALICIOUS

PDF

11.8 KB
MD5: 025a981fe7dfaca69f82ab27707582a8 SHA-1: 110da00eebc8495c00e23f57a8282c83f13cc6b8 SHA-256: c1907b55ef0aac99ecc737ff2992c88d603cc6105bd672d4ed7e90acdced0d29
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment T1059.001 PowerShell

The file is identified as a malicious PDF by multiple heuristics, including an ML classifier and ClamAV detection (Pdf.Exploit.Dropped-78). The presence of an embedded script payload and an embedded file suggests it is designed to exploit vulnerabilities and download a secondary payload. The PDF structure also indicates the use of XFA forms, which have been historically exploited.

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
88953ca1f8f125e66b9b55f10ba6eb44dfb946499d8215a99ce998b334d76bc0
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11317 bytes