Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8d58e8a4f704a0…

MALICIOUS

PDF

43.0 KB
MD5: e5ace37eca3c85352e13d0f722003884 SHA-1: bb92e66bc23d5cfaf5988095e4beb8b0d1589342 SHA-256: af8d58e8a4f704a0eae4a558d9cbf7c244d6c84a0033e8ff14790d7f1f0808d2
188 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious Attachment

The file is a PDF document flagged by ClamAV as Pdf.Exploit.Agent-36834, indicating it contains an exploit. Heuristics confirm the presence of an embedded script payload and an embedded file, both common delivery mechanisms for exploits. The ML classifier also strongly indicates maliciousness. The embedded script payload is likely responsible for executing the exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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
f311c705f4c5a02c0bf8807e5a7407099861a0a9c6721cbd80d15e1cb5e9d010		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 684 bytes
embedded_file_obj0010.bin
1c5b7971dff586207e8235b49916e2677297f244f218ae7d19c6ac9623332af8		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x459 100 bytes
embedded_file_obj0011.bin
c41b80b4dd502751c00f4ca6223d3dfade17b05482418df6c84ec7bc4b29ce26		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x508 584 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x79B 190 bytes
embedded_file_obj0014.bin
bf0b46aee59cbd0c3ed7b2e39ff8ccd9da097d732061a847fb5910252011964c		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x8A6 41047 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36834
Obfuscation or payload: unlikely
embedded_file_obj0015.bin
03172373f36e220deaea3baf69186e2a8bef99633879227f39b2a0b4510201ee		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xA947 138 bytes

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