Malicious PDF — malware analysis report

Static analysis result for SHA-256 291d549a1de490f2…

MALICIOUS

PDF

44.8 KB
MD5: ea7b85d46645b7ab047e747458ce7db3 SHA-1: 73af6cc4dfe29963d8fe8e2a8fcef0c4de820af9 SHA-256: 291d549a1de490f2c0ed4b183b9009a8c89a142c208a05f33dea7c48e6cd2ee1
118 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File Execution T1204.002 Malicious File Execution: User Execution: Malicious File T1059 Command and Scripting Interpreter T1059.001 Command and Scripting Interpreter: PowerShell

This PDF document contains embedded executable scripts, indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' and 'PDF_XFA_SCRIPT' heuristics. The ML classifier also flagged it as highly malicious. The embedded script likely attempts to download and execute a second-stage payload, as suggested by the presence of an embedded file artifact named 'embedded_file_obj0011.bin'. The document body text is obfuscated and does not provide clear user-facing content.

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 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
  • 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.
  • 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 0xE2 84 bytes
embedded_file_obj0009.bin
eac990b4493e9e74ef1fafae6387cb52628093bb4bb37b7b359c7c5cb638c427		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x180 641 bytes
embedded_file_obj0010.bin
0e29744e91a4f723e94d101a1c254049b25b112de8de3af4b7b747f96140080d		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x44C 100 bytes
embedded_file_obj0011.bin
d7c9f020750dae51144cb1930d558d9670b1360a71d3ed9ed929cb4db649434c		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x4FB 532 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0012.bin
e91adafe4323fbdd4002682aad948eaa165718622cea8d515bb0788d4b95260c		 pdf-embedded-file PDF EmbeddedFile object 12 at offset 0x75A 162 bytes
embedded_file_obj0014.bin
e365f35bec223ea8e384a8072b2fecb3c8fa3f5bc2bedfaa351cfa9b7432b7ec		 pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x849 42999 bytes
embedded_file_obj0015.bin
78b09463af5cd373870eae2e3e83de87b7f6b659e0d0117ab4c09d90ebb2ad95		 pdf-embedded-file PDF EmbeddedFile object 15 at offset 0xB08A 68 bytes

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