Malicious PDF — malware analysis report

Static analysis result for SHA-256 f677259ed6aceb03…

MALICIOUS

PDF

15.2 KB
MD5: bf05533c8672141dd67edd55c6df04a3 SHA-1: c8108d6ede1aa53ad9071b7e47d653312bc7470c SHA-256: f677259ed6aceb035bbd966e6e549cab49b7ef30bd894447a1df232f4d634d97
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple high-confidence heuristics, including an ML classifier and ClamAV detection (Pdf.Exploit.Dropped-78). The presence of an embedded script payload and an embedded file further indicates that this PDF is designed to deliver a secondary malicious payload. The specific exploit or delivery mechanism is not detailed in the provided evidence, but the overall pattern suggests a common PDF-based attack vector.

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
0df73dcd90a6f1da7f90f37e35c05c18ac3ae08b567a7e848baf10207d5953bb
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 14789 bytes