Malicious PDF — malware analysis report

Static analysis result for SHA-256 e26b13a1fd7be412…

MALICIOUS

PDF

11.8 KB
MD5: 0c8d545b80071dff1c49058b92b9c507 SHA-1: 38ca5fb55ade7bdc525433fc361988b3165ce9db SHA-256: e26b13a1fd7be4123612a1e7fef8ac7b3dd6413613158d09a7d008fc6fd88abc
128 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 also detected by ClamAV as Pdf.Exploit.Dropped-78. Heuristics indicate the presence of an embedded script payload and an embedded file, suggesting it is designed to exploit vulnerabilities and drop a secondary malicious file. The embedded URLs are not directly indicative of malicious activity.

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
0fb09abe3b8ad81d538fa35c03449a7663e92a153688471a3b2b6901f477bf3a
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11325 bytes