Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8fb499ca52e6c0…

MALICIOUS

PDF

1.31 MB Created: 2010-09-17 16:07:30 +08:00 Authoring application: Foxit PDF Creator Version 3.0.1.0109
MD5: d99c22137c6194841fa83105fa9b59c3 SHA-1: beb3ef228fa062f998d49819154f16b160bc00fa SHA-256: fa8fb499ca52e6c003ca66a206066124742b21063e584b9cf8922905f14cd009
216 Risk Score

Malware Insights

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

This PDF file exploits CVE-2010-2883, a vulnerability in Adobe Reader's CoolType SING font parsing. The embedded JavaScript, triggered by an AcroForm button action, is heavily obfuscated but indicative of a downloader. The presence of multiple JavaScript streams and a secondary embedded PDF with similar suspicious findings further supports this. The primary goal appears to be the execution of a second-stage payload.

Heuristics 11

  • Adobe Reader CoolType SING font exploit — CVE-2010-2883 critical CVE likely CVE_2010_2883
    PDF embeds a TrueType/OpenType font with an actual SING table and pairs it with JavaScript heap-spray shellcode. This matches the public Adobe Reader CoolType SING exploit shape for CVE-2010-2883.
  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • 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/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xfa/promoted-desc/
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/
    • http://www.xfa.org/schema/xfa-locale-set/2.7/
    • http://www.xfa.org/schema/xfa-locale-set/2.6/
    • http://www.xfa.org/schema/xfa-form/2.8/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 11

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0026_000.js
2f574ea0a0abb643798c6edf545b9a2510056a799ef48c2f415cee8e337043b2		 pdf-javascript-stream PDF /JS object 26 at offset 0x47BF 9909 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
icc_00_off000906bc.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0x906BC 3144 bytes
font_00_sfnt_off000149fa.bin
422bc5698ba5d9d4818f6a2d8b3abca2f723e713b44a15c390139d2c976a1388		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149FA 65932 bytes
font_01_sfnt_off0001e85c.bin
7e24ee16c8b09ee74d61445f29c3c0a95abfdf17fc1008606394f159dbd0c106		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E85C 65932 bytes
font_02_sfnt_off000286ba.bin
57e24925bc6bdb98d38e8b4ba3b87f80f75c5e49ea9a522486790d7dc6848549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x286BA 65932 bytes
font_03_sfnt_off000324e1.bin
1f068d668b316fcb46f0801be00137fb749cc7fda5ca15e442829d6c303d8f99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x324E1 65932 bytes
font_08_sfnt_off0014ada0.bin
224bf8c4ac436a54706cfaf2798e2bee2c63a0a458732e4f14b2152ec85b853f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14ADA0 29892 bytes
javascript_obj0026_000_1.js
a85d1f61ffeaa39c253fb543a72ba648f16b0815069dfa09292e5b30a42e0d02		 pdf-javascript-stream PDF /JS object 26 at offset 0x47BF 8527 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
javascript_obj0026_001.js
2cf8d5f7b32aaa60ff845bc53b2a9f8b8285d238f07bbaf79f2e7bf9b54829f5		 pdf-javascript-stream PDF /JS object 26 at offset 0x47BF 3369 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
polyglot_child_pdf_off0003ca8f.pdf
d1b4542c4f5f39d6c5007fa1ed228e7259940ce2eba4aba650bfa62217b17e51		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x3CA8F 1126724 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 10 long base64-like blob(s).
polyglot_child_pdf_off0009064a.pdf
81c60a9fb24efc2a6a308af88777e4b859b1012652a30f877087ae05323f7734		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x9064A 783753 bytes

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