Malicious PDF — malware analysis report

Static analysis result for SHA-256 9187b243450bafd1…

MALICIOUS

PDF

43.1 KB
MD5: 78ed29ec0acfc960d899838ca3c29026 SHA-1: c21ef9eb833e702780b7115f84e1d16300a6ae02 SHA-256: 9187b243450bafd189179096afa4052cc63b7463513da0d253d0cc500ac3b45c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File

The critical ClamAV detections indicate this PDF exploits a known vulnerability, likely to download and execute a secondary payload. The presence of embedded files and scripts further supports this, although the specific script content was not detailed enough for further analysis. The embedded URLs are related to XFA forms, which are sometimes used in exploit chains.

Heuristics 6

  • ClamAV: Pdf.Exploit.Agent-36834 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36834
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
04462f810d6eacdacecc9d0a5f3f81bebc722af4415e04da19b520338f642b51		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xD7 67 bytes
embedded_file_obj0009.bin
4cebd3b02eecc14745c1fada161693586c9e25014ef3878c4636500900667bd0		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 690 bytes
embedded_file_obj0010.bin
1870a8c90be73ebe36ae508f57c55ef58407515a4ad8c7e867914369cf2923c9		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x45F 99 bytes
embedded_file_obj0011.bin
0cbb762401cc804c890a42a0dbec953f9a71f826e34c05311262bd4e53e365f3		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x50D 580 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x79C 190 bytes
embedded_file_obj0014.bin
f2f1386634fda6ed81d6be83b62f5ebe1b2894460be591a23def33fa8f3e5ae1		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x8A7 41150 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36834
Obfuscation or payload: unlikely
embedded_file_obj0015.bin
78b09463af5cd373870eae2e3e83de87b7f6b659e0d0117ab4c09d90ebb2ad95		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xA9AF 68 bytes

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