Malicious PDF — malware analysis report

Static analysis result for SHA-256 f396afb540cdc9fd…

MALICIOUS

PDF

45.7 KB Created: 2012-06-09 08:00:07 +04:00 Authoring application: Adobe Designer 7.0
MD5: 7833c83a68cb2092720ace24b00d39c0 SHA-1: 49e013b0086a363a402fc264ed6744c2e6c38d9f SHA-256: f396afb540cdc9fd8148483ed6c69b732b7450e248f1d85db80b0d4c631666a1
94 Risk Score

Malware Insights

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

This PDF document contains a high-severity XFA form with risky executable script, indicated by the 'PDF_XFA_SCRIPT' heuristic. The script is embedded and likely serves as a payload delivery mechanism, as suggested by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic and the presence of an embedded file artifact. The document's structure and the embedded script point towards an exploit attempt to download and execute additional malicious content.

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.
  • 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. (matched inside decoded stream)
  • 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 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0042.bin
c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb		 pdf-embedded-file PDF EmbeddedFile object 42 at offset 0x8349 85 bytes
embedded_file_obj0043.bin
5c2d5614d44acbbe2e457784cbd3e50d08745cc48bdef65e7f97353fd1ef37ad		 pdf-embedded-file PDF EmbeddedFile object 43 at offset 0x83FB 1523 bytes
embedded_file_obj0044.bin
2c54f797311335a1e53620da1caf3456005e53aac1dc17fca91dd26964d6507c		 pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x86CD 12869 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
embedded_file_obj0045.bin
3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169		 pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x9573 144 bytes
embedded_file_obj0046.bin
57045217c453d4674a08ad8778674bf199a7989a9505424a1815c016e6bb412f		 pdf-embedded-file PDF EmbeddedFile object 46 at offset 0x9635 212 bytes
embedded_file_obj0047.bin
ce4a3f07835c725838e55947d6b1f21771e0ad8084ee86d0890ecc12bd5231fd		 pdf-embedded-file PDF EmbeddedFile object 47 at offset 0x972C 2427 bytes
font_00_cff_off00001365.bin
23831e143e2e1a484b95ee765b15d94562c951468b895c080e655667dc04ddf0		 pdf-font-stream PDF embedded font (cff) at offset 0x1365 31178 bytes
font_01_cff_off00009afc.bin
4adc617e9f5b6d6d16340cb785ea65b474b6db00fe3453e78b8d394e9a75cd47		 pdf-font-stream PDF embedded font (cff) at offset 0x9AFC 2098 bytes

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