Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b27a0d78936db25…

MALICIOUS

PDF

12.0 KB
MD5: d9b1f1377b95a6ac2941e82656de1985 SHA-1: 398f8b97b6c52c55f91739b1a906db71cb91cbff SHA-256: 1b27a0d78936db2523b23c7c3e2aa768a3d8bb4a91190b17930af8598c49699d
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Exploit.Dropped-78' and a high ML classifier score. The presence of an embedded script payload and an embedded file object indicates the document is designed to execute malicious code. The embedded file, 'embedded_file_obj0008.bin', is likely the delivered 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
30cc91ba7fa17a78afbe5f6b1c5716fd547f7662881dc3bf66abaeb35f436902
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11582 bytes