Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73ede4f8ab16750…

MALICIOUS

PDF

19.3 KB
MD5: 83a8f0667131550b1a1a11b0534dc020 SHA-1: 2b66aa8260976e4add2ba1bbcfb8d68d828154dc SHA-256: f73ede4f8ab16750f06c8f86d839a54a72d03f8efd8eb18014493baf37e8b2b1
96 Risk Score

Malware Insights

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

The PDF contains an embedded script payload, indicated by the PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic. ClamAV detection as Pdf.Exploit.Dropped-78 further confirms its malicious nature. The embedded file and XFA form suggest a technique for delivering and executing malicious code. The primary IOC is the ClamAV detection name, which often correlates with specific exploit chains.

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
f07eb192c1f94548e30d541a75e0fcb3e1b82e153f2b737eb1450840b4e7615f
pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 19026 bytes