MALICIOUS
578
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1059.007 JavaScript
Multiple critical heuristics indicate the exploitation of Adobe Flash Player vulnerabilities (CVE-2011-0611, CVE-2009-1862, CVE-2010-3654, CVE-2009-4324) via embedded RichMedia/Flash content within the PDF. The JavaScript action `media.newPlayer(null);` is used as an exploit loader, likely to download and execute a second-stage payload. The presence of multiple exploit-related findings and a high ML classifier score contribute to the confidence in this assessment.
Machine Learning
- Nyx PDF Classifier malicious score 0.9956
Heuristics 14
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Adobe Flash Player RichMedia exploit critical CVE likely CVE_2011_0611_FLASH_RICHMEDIAPDF combines RichMedia Flash activation with an embedded AS3 SWF loader (ByteArray/loadBytes) and shellcode heap-spray staging. This is the static exploit shape associated with CVE-2011-0611 Flash content delivered through Adobe Reader.
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Adobe Flash/authplay SWF exploit in PDF — CVE-2009-1862 critical CVE likely CVE_2009_1862_FLASH_RICHMEDIAPDF combines RichMedia Flash activation, an embedded SWF, and PDF-side shellcode heap-spray staging. This matches the 2009 authplay.dll Flash-in-PDF exploit delivery shape even when the SWF bytecode does not expose stable printable Run_Sploit markers.
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Adobe Reader authplay SWF exploit in PDF — CVE-2010-3654 critical CVE likely CVE_2010_3654_FLASH_RICHMEDIAPDF combines RichMedia Flash activation, an ActionScript 3 SWF containing DoABC/SymbolClass code with URLRequest or StagePlayer/ByteArray/loadBytes markers, and PDF-side shellcode heap-spray staging. This is the static delivery shape associated with CVE-2010-3654 Adobe Reader/Acrobat authplay Flash handling.
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media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
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Flash ActionScript-3 exploit loader in PDF critical PDF_FLASH_AS3_EXPLOIT_LOADERAn embedded Flash (SWF) object's ActionScript-3 bytecode contains exploit-loader primitives: decompressing an inner SWF into a ByteArray and executing it via LoaderContext.allowLoadBytesCodeExecution, and/or Vector heap/JIT spray groomers. Benign Flash content does not load and execute code from raw bytes — this is a staged Flash exploit delivered through the document.
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Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGEA 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.
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JavaScript action low 2 related findings PDF_JAVASCRIPTPDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
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PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTERPDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.Matched line in script
var nop = unescape("\x25\x750c0c"); -
Embedded JS stream low PDF_JSPDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
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RichMedia (Flash) high PDF_RICHMEDIAPDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (matched inside decoded stream)
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Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGEOne 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.
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Embedded file low PDF_EMBEDDEDPDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (matched inside decoded stream)
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Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTALThe same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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Embedded URL info EMBEDDED_URLOne 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# In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
Extracted artifacts 7
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
stream_002_off00000392.bin |
decompressed-pdf-stream | PDF FlateDecoded stream at offset 0x392 | 4264 bytes |
SHA-256: 1d55d11c525bdc8044239c6474495d123a90827cbb3ab7de1ed5718e2cdc612e |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s). Carved artifact contains 1 long hex-escaped blob(s).
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legacy_pdfkit_stage_000.js |
deobfuscated-js | string-concatenation normalized Acrobat API aliases at offset 0x392 | 126 bytes |
SHA-256: 42c3f4df375ff6f58ff655cc4f88b5cc28f0dd33b978390db3538684a6219b74 |
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Preview scriptFirst 1,000 lines of the extracted script
media.newPlayer(null); /* AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA */ |
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objstm_0017_00.bin |
pdf-objstm-decoded | PDF /ObjStm 17 0 obj (inflated) | 871 bytes |
SHA-256: dd7918c182d6e2b8d996a6b8ee81663c49a0cb297efe1e1fa3c5af0c987bde84 |
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font_00_sfnt_off00017957.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x17957 | 104784 bytes |
SHA-256: 1f8d70872fd6ebcda26ad7000a9cb25d9d257cedf5ac03917264eb10c24ed7c1 |
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font_01_sfnt_off0002608a.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x2608A | 64968 bytes |
SHA-256: a96bb991c51e670517225e7949cf43ab4296d76bc6b5a1782324f2eb2df29f5b |
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polyglot_child_pdf_off00013a8f.pdf |
polyglot-child-pdf | Secondary PDF body inside pdf container at offset 0x13A8F | 114508 bytes |
SHA-256: 9dbd649cbfc7f88eeb59ddc7034d9713b6c04b0e19cbaf0e095a81699a6508d4 |
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polyglot_child_pdf_off0002e1ee.pdf |
polyglot-child-pdf | Secondary PDF body inside pdf container at offset 0x2E1EE | 6125 bytes |
SHA-256: 0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8 |
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