Malicious PDF — malware analysis report

Static analysis result for SHA-256 477ebb1635ea2dc9…

MALICIOUS

PDF

25.9 KB
MD5: bbf08faf338ffeebecf75abe17571847 SHA-1: a583f4ebc0480a230dac554ab882fec93bb87d42 SHA-256: 477ebb1635ea2dc9ca68a4cf8033ebe4e0a541a1932a25a2702fd40b6b75d0a7
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including embedded script payloads and a high ML classifier score, indicating malicious intent. ClamAV detection as 'Pdf.Exploit.Dropped-78' further confirms its malicious nature. The embedded script, though partially obfuscated, suggests the PDF is designed to download and execute a second-stage 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
ad082d5ae75f41932c15e508a8dfff49cb07e79c91f368bcf26b337ad82298c2
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 25723 bytes