Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e4a984b8aa42fc…

MALICIOUS

PDF

42.9 KB
MD5: e795d35a31098cd23daebea989243f95 SHA-1: 24dbb436071dcff6892e3777b4eae82d8e98657d SHA-256: 16e4a984b8aa42fc199cb940e1ef5ed8867c128d357e3f1b849b3bc5223a0f75
176 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as 'Pdf.Exploit.Agent-36834'. The presence of embedded files and XFA forms suggests an exploit targeting PDF rendering or scripting capabilities. The embedded script payload is likely responsible for executing the malicious payload, leading to the detection of an exploit for client execution.

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 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 script payload in PDF stream low 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 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
369daf9e147dac0d57a8a48827cff3bf3509d6c5927af3b189f5bc9a0b9f0aa5		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 685 bytes
embedded_file_obj0010.bin
1c5b7971dff586207e8235b49916e2677297f244f218ae7d19c6ac9623332af8		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x45A 100 bytes
embedded_file_obj0011.bin
860f2b7ad0c4647f4db631ed1152b4a5ff6fa428f66c5deaf0ec6561d195afe9		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x509 546 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x776 190 bytes
embedded_file_obj0014.bin
262b51195d021aada62e445b77baa93eb6f62b95948939ac0484d255e7cc20a5		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x881 40888 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36834
Obfuscation or payload: unlikely
embedded_file_obj0015.bin
51d6d76eddb1746e412f89f4d1c1b0d620c60fb4a5641c018e93871be63968a9		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xA883 147 bytes

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