Malicious PDF — malware analysis report

Static analysis result for SHA-256 42891056c2030267…

MALICIOUS

PDF

12.0 KB
MD5: ab784bfecf8ae9d17d3a70a090dcf480 SHA-1: 16c8a10805433f644765084987b7bcb91f7e8217 SHA-256: 42891056c20302674e8a2e61e57fa7073c9ba388e1cf0bbea1029724899a060e
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 and ClamAV as malicious, specifically indicating it's an exploit dropper. Heuristics confirm the presence of an embedded script payload and an embedded file, common techniques for delivering secondary malware. The embedded URLs, while not directly malicious, are part of the PDF's structure.

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
7be47c3f3796882bbc3fcb008f334652c2d4fafa622cde349fe80b8f774ae0b2
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11544 bytes