Malicious PDF — malware analysis report

Static analysis result for SHA-256 8775b877ba0f7b7c…

MALICIOUS

PDF

18.9 KB
MD5: 028556759d3d9afcb7dc6857a0cd5e73 SHA-1: b7de75a0b5a5a33a24c5ea4107755e1238a7c1af SHA-256: 8775b877ba0f7b7c862f962f5f4dcc5c0e321e5635056c681edf0375da94e8eb
126 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 with a high degree of confidence. It contains an embedded script payload and is flagged as a PDF exploit. The presence of XFA forms and embedded files suggests a complex attack vector, likely aimed at exploiting PDF reader vulnerabilities to download and execute 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
0eadd552c98cbb927fa3bd87e8f8609c49025b6f60d908aa4fb49906a7aacc00
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18612 bytes