Malicious PDF — malware analysis report

Static analysis result for SHA-256 49cde71e42a6ea81…

MALICIOUS

PDF

19.0 KB
MD5: a8865c9e7c491d1efe97a1eab45582b1 SHA-1: 99f97125041c675b455ea5ea24c9c6798ed5bce3 SHA-256: 49cde71e42a6ea81bc563bc37d570940ccff8b8482a10d404dfd92999b62bb15
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 as Pdf.Exploit.Dropped-78. Heuristics indicate the presence of an embedded script payload and an embedded file, suggesting the PDF is a dropper. The embedded URLs, while not directly malicious, are part of the PDF structure. No document body text was available for analysis.

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
eaedbeb934f96fa463f9b029e452202857f87a7e61fe4c3921c6be694f8e6431
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18720 bytes