Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8ac1509cc3ea08…

MALICIOUS

PDF

46.6 KB
MD5: bbf51490495768311c694bf1baa2cdd2 SHA-1: 7a7c6e0ce7e04695ae90967727ed069ae0b4b5fb SHA-256: 7a8ac1509cc3ea08c30ab7f861da42b412e44afc738c17f2d85981610618ba54
106 Risk Score

Malware Insights

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

The PDF sample contains embedded JavaScript, flagged by multiple heuristics as risky and malicious. This script is likely responsible for downloading and executing a secondary payload, as indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' and 'ML_NYX_PDF_MALICIOUS' firings. The presence of embedded files, particularly 'embedded_file_obj0011.bin', further supports the payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
  • 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
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules.
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xD7 84 bytes
embedded_file_obj0009.bin
7d79d45bd272e58bca47c56a9750f3c89fece03cff8b778b8da87eb19700de2f		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x16F 627 bytes
embedded_file_obj0010.bin
7f0250007a0b80acf6d82800370ea1b94ab67f16e7b58adb83d5d0ba9da40e3f		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x427 95 bytes
embedded_file_obj0011.bin
aea7b89187d50cb738d63de1864d78345fde99cfa63ef893f96a30b2e593c08d		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x4CB 501 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0012.bin
9a3d5b61e8cc421ddfd7e83b56ed2c3a3a4b566c7df6acfd14e675c598f13083		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x705 153 bytes
embedded_file_obj0014.bin
82e74dd7a7cdab02388d80e23c9b8664ed0c3189454b8c8b284fdd156d01c2fc		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x7E5 44976 bytes
embedded_file_obj0015.bin
6f0c029b6d16ee8c8a055ce3c9de61abb4666ed853aba10079b3dc0c4a5f3999		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xB7D9 67 bytes

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