Malicious PDF — malware analysis report

Static analysis result for SHA-256 4369a2c3a13191c9…

MALICIOUS

PDF

11.7 KB
MD5: 113bf98c0d24bbede400793ede88b110 SHA-1: 5a2ba1f33b201b5b06c37522a16e58aeb90284c8 SHA-256: 4369a2c3a13191c951230ab935d2b97dbd2065236f939d853ff011af2aa67201
126 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File 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 suggests it is designed to exploit vulnerabilities and download or execute a secondary payload. The XFA form structure is also noted, which can sometimes be leveraged for exploits.

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
af8cefaca9bf881374d92f7806217de675539c42c3e20728b4da49b6b75b602b
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11267 bytes