Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bda8fa38c2072d…

MALICIOUS

PDF

26.3 KB
MD5: 34ec69bea4aa70bf5bf6cc8a4c73923c SHA-1: f283d4858f72099155a1631b54455455c774e42d SHA-256: f8bda8fa38c2072d5bb54dfaed6ef99aad04866af588bc5a0fe46ff0641d4bbf
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 a high probability of being malicious and was also detected by ClamAV as 'Pdf.Exploit.Dropped-78'. The presence of an embedded script payload and an embedded file further indicates malicious intent. The embedded URLs are not considered malicious.

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
7e7b91590d90c940a38ebd500066fda377dc22371017d4759aca79569d388d6d
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 26195 bytes