Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa84452215c343b9…

MALICIOUS

PDF

11.5 KB
MD5: 9b3f3f7657cb094669b3dd77db659af4 SHA-1: 0fa9978b68026dec44e01f9cddc8fbce259ae8df SHA-256: fa84452215c343b95f517402bec3dd248797eb3d8c8453d627594f17c88d8043
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier with high confidence and detected by ClamAV as Pdf.Exploit.Dropped-78. It contains an embedded script payload and an embedded file, indicating it is likely designed to exploit vulnerabilities and drop further malicious content. The presence of XFA form elements and embedded URLs, though some are benign, are common in exploit-carrying PDFs.

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
85524f2ab6732f64089ecfd35fab6217636af07b72e2c4fca1dad84a892662bb
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 10977 bytes