Malicious PDF — malware analysis report

Static analysis result for SHA-256 15fe6f49f9ccf3a7…

MALICIOUS

PDF

745.3 KB
MD5: 382477d28f190647ab2c9c7b451558a9 SHA-1: 90aa3408d2a885149259cf51e901727bf1ec9d77 SHA-256: 15fe6f49f9ccf3a7b73d9782ea143554b91db56207680f431bbba7db604d8588
268 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript and exploits CVE-2010-2883, a known vulnerability in Adobe Reader. The JavaScript code is heavily obfuscated but appears to be constructing a URL or command to download and execute a secondary payload. The presence of XFA forms and the use of ASCIIHexDecode filters further indicate malicious intent. The embedded URL 'http://www.bitstream.com' is the only IOC identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF 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.
  • 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.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The 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.
  • 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.bitstream.com
    • 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 13

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0026_000.js
1d1885b6c800938e7ec00d369726a3bf52b65eebedcdd60cc006c36da6cab07f		 pdf-javascript-stream PDF /JS object 26 at offset 0x47BF 9609 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
stream_017_off0003d1f9.js
672d461752be4a970c8e9721164ce074d252b55d09d46cc09259d2ce4fc09f7f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3D1F9 1546 bytes
stream_018_off0003d4b6.bin
29cf1edfedd4f27f3c450646c5dc2510e6bf9e63eee1cd436ac517a465a2e1bf		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3D4B6 1650 bytes
stream_019_off0003d826.bin
0f910ffeec733940f6ba1ae41dc6770eab5d615c05bccc95197878b62c8dc45f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3D826 2928 bytes
stream_021_off0003ddbb.bin
4a60a9864cdf7382475d51051a03fdc43b32c31eb508893ccfccece34957f9f1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3DDBB 56 bytes
stream_022_off0003de43.bin
fe122a09d8a0444608fdc5a6f4981a2dbd469f5bbfacb4bdd327c28ccc343e13		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3DE43 149 bytes
font_00_sfnt_off000070c8.bin
e31f8c8507e52f29008d946a00becde9f839e34cb108985ce66167bf881adafa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70C8 8084 bytes
font_10_sfnt_off000149fa.bin
422bc5698ba5d9d4818f6a2d8b3abca2f723e713b44a15c390139d2c976a1388		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149FA 65932 bytes
font_11_sfnt_off0001e85c.bin
7e24ee16c8b09ee74d61445f29c3c0a95abfdf17fc1008606394f159dbd0c106		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E85C 65932 bytes
font_12_sfnt_off000286ba.bin
57e24925bc6bdb98d38e8b4ba3b87f80f75c5e49ea9a522486790d7dc6848549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x286BA 65932 bytes
font_13_sfnt_off000324e1.bin
1f068d668b316fcb46f0801be00137fb749cc7fda5ca15e442829d6c303d8f99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x324E1 65932 bytes
javascript_obj0044_000.js
c29c6bb477de5ad6cdf3bf4e69d8333510d90b6620695e84edc2566db74f54f7		 pdf-javascript-stream PDF /JS object 44 at offset 0x1D29 9604 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
polyglot_child_pdf_off0003ca8f.pdf
d2aab737cce0c8a114e4742939d11ad1da723ca2cae1cdca45dac37a97caa97d		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x3CA8F 514695 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.