Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf49f0f9864ccdb…

MALICIOUS

PDF

11.5 KB
MD5: eb659d3c4fd00f776f0a086e70e1dd92 SHA-1: ddf701823d30a9f9d2d7cc0f9b0e50dbf21295b4 SHA-256: ecf49f0f9864ccdbd7612c3d62e1ff42406c60082529fc11f580c31f43743bb1
128 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 heuristics, including a critical ClamAV detection (Pdf.Exploit.Dropped-78) and a high ML classifier score. The presence of an embedded script payload and an embedded file suggests the PDF is intended to exploit vulnerabilities and drop a secondary payload. While no specific family is identified, the attack pattern is consistent with exploit-laden documents.

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
70e0c1b7178a319fd30c88750a7e8edba8addf2ee856fb362d8e3daf57037271
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11038 bytes