Malicious PDF — malware analysis report

Static analysis result for SHA-256 3247dbb2a9198da4…

MALICIOUS

PDF

40.4 KB Created: 2012-05-21 15:17:25 +04:00 Authoring application: Adobe Designer 7.0
MD5: 1ce7d1d22eef9b8b5849f65068bdb49f SHA-1: 55feb14b6ba6d551b553edcd429d48af41000b5f SHA-256: 3247dbb2a9198da4efdb339ad0a728f737e45d87b466b27438a7c1a62f38d5bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious File

This PDF document exhibits multiple high-severity heuristic firings, including the presence of risky executable scripts within an XFA form and the use of unescape() for obfuscation. The ML classifier strongly indicates maliciousness. An embedded file, 'embedded_file_obj0042.bin', was also identified as a suspicious artifact. The combination of these factors suggests the PDF is designed to exploit vulnerabilities and deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0040.bin
c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb		 pdf-embedded-file PDF EmbeddedFile object 40 at offset 0x7175 85 bytes
embedded_file_obj0041.bin
be1b34acf1e2a53a51c182c5e47f66fa2c21cbf510178e5753bed75e5fb40892		 pdf-embedded-file PDF EmbeddedFile object 41 at offset 0x7227 1341 bytes
embedded_file_obj0042.bin
a835dd09526fbee91c1de391f4413bd3e8a1fd613f844419c739df4d5ab7cb74		 pdf-embedded-file PDF EmbeddedFile object 42 at offset 0x74BA 59857 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
embedded_file_obj0043.bin
3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169		 pdf-embedded-file PDF EmbeddedFile object 43 at offset 0x8517 144 bytes
embedded_file_obj0044.bin
ce4a3f07835c725838e55947d6b1f21771e0ad8084ee86d0890ecc12bd5231fd		 pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x85D9 2427 bytes
font_00_cff_off0000126e.bin
23831e143e2e1a484b95ee765b15d94562c951468b895c080e655667dc04ddf0		 pdf-font-stream PDF embedded font (cff) at offset 0x126E 31178 bytes
font_01_cff_off000089a9.bin
23b8b30e11470dd1ba6a3654d6ba1295fafa50e0fef4ed7956d19f35b61d0f9f		 pdf-font-stream PDF embedded font (cff) at offset 0x89A9 1192 bytes

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