Malicious PDF — malware analysis report

Static analysis result for SHA-256 87aa6f2b72789455…

MALICIOUS

PDF

19.3 KB
MD5: 389d15427e5d4b9b24bfc06598b8400d SHA-1: 82efaf5d0fe9360181bc97ba2d73be27e12ec84b SHA-256: 87aa6f2b72789455b603f54dd286df1a95bed2cac4b461bbd638bf7ddf81c5cb
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple high-confidence heuristics, including ML classification and ClamAV detection (Pdf.Exploit.Dropped-78). The presence of an embedded script payload and an embedded file further indicates malicious intent. The PDF structure and embedded content suggest it is designed to exploit vulnerabilities upon opening, leading to the download and execution of 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
ed2c38dce72e7d06447281633dfcbb0d85923e6a493b9aa5b6ddf4a9a28727f5
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18977 bytes