Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c40ca688ca3909…

MALICIOUS

PDF

43.2 KB
MD5: bdc8bc88056c4f1303076f8ea59caec1 SHA-1: bb461d05b0068e0065e90e09c5a2f0cee2a29e29 SHA-256: 07c40ca688ca390911ae54780263710249eda1e29b5023af9bec1b4d5e0fe4a0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious intent. The presence of XFA forms and embedded files suggests an exploit is being used to execute a payload. The embedded script, though obfuscated, likely contributes to the execution chain.

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
b203764a19fc481d603fc7298e33382c047c9db27129f516cbbe3b17497a338f		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x162 690 bytes
embedded_file_obj0010.bin
1c5b7971dff586207e8235b49916e2677297f244f218ae7d19c6ac9623332af8		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x45F 100 bytes
embedded_file_obj0011.bin
19da0d2a864399c31606ea264da569b7007a75ba88176f0400ead1a3c258d9b5		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x50E 573 bytes
embedded_file_obj0012.bin
d2f06f3fc6900856fe613a64a561919c8454dcbe0fdf238fb8b43e07016955ea		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x796 190 bytes
embedded_file_obj0014.bin
6a4930714fb6c326718b0c3063d9387b16429d402fb4342762330ce2601ff29e		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x8A1 41227 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 0xA9F6 138 bytes

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