Malicious PDF — malware analysis report

Static analysis result for SHA-256 f491c538b608bbee…

MALICIOUS

PDF

11.7 KB
MD5: 885543807f35ea9a80dcdc7ce1603cb9 SHA-1: 5041578e19397f128365d2096ff25c54a12acf7a SHA-256: f491c538b608bbee34b66481c57a02e953250b4485ae1aaddb8d2213cc00c12f
96 Risk Score

Malware Insights

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

The PDF contains embedded content and a script payload, as indicated by the PDF_EMBEDDED and PDF_EMBEDDED_SCRIPT_PAYLOAD heuristics. ClamAV detection as Pdf.Exploit.Dropped-78 strongly suggests malicious intent, likely involving the exploitation of a PDF vulnerability to drop a secondary payload. The embedded URLs are benign or unknown, and the document body is not human-readable, thus the rationale is based on the embedded script and exploit detection.

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
9330c96b0bf50377c73f110d4250eaef77e6f0e258d151bf4d47d56d97ceb732
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11236 bytes