Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf90ac2075b34509…

MALICIOUS

PDF

33.2 KB Created: 2010-08-29 16:19:36 Authoring application: RahonyzonobItydygiqif SyderdapelasEetofah
MD5: 31a9552fc57c5b34a888cf5b742627b6 SHA-1: 5c8d30599b1d7329547b08c720d48a4ce7860de0 SHA-256: cf90ac2075b345094068ed64ac4a73c9fd2965c70fd10a499a9d1ad18a9ba2fe
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

This PDF file exhibits multiple high-severity heuristic firings, including PDF_EVAL and PDF_XFA_SCRIPT, indicating the presence of executable script content within an XFA form. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded script payload, identified as 'embedded_file_obj0007.bin', is likely responsible for downloading and executing a secondary payload, as suggested by the 'Pdf.Exploit.Dropped-81' ClamAV detection. The document body contains obfuscated JavaScript-like code, further supporting the script execution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 8

  • 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.
  • ClamAV: Pdf.Exploit.Dropped-81 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-81
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • 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
  • 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://ns.adobe.com/xtd/
    • 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_obj0005.bin
f1b002601cb5d50882c80ae040e8a50e73ec8a537f85d06905f302700ccb4190		 pdf-embedded-file PDF EmbeddedFile object 5 at offset 0x1CA 86 bytes
embedded_file_obj0006.bin
24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0		 pdf-embedded-file PDF EmbeddedFile object 6 at offset 0x26A 228 bytes
embedded_file_obj0007.bin
c55fbc91aac720a24087995487561be1cc79cc4622cc47211bb170cdbc7144f5		 pdf-embedded-file PDF EmbeddedFile object 7 at offset 0x399 1891 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0008.bin
c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xB46 199 bytes
embedded_file_obj0009.bin
9bebfdac9c39ce522c021c299343549bba4276f0da02132d003ca4ac907d3e16		 pdf-embedded-file PDF EmbeddedFile object 9 at offset 0xC59 29110 bytes
embedded_file_obj0010.bin
e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876		 pdf-embedded-file PDF EmbeddedFile object 10 at offset 0x7E59 77 bytes
embedded_file_obj0011.bin
92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x7EF0 56 bytes

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