Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b2d3eecb2d62bc…

MALICIOUS

PDF

143.1 KB First seen: 2026-05-10
MD5: 1ccc09e9f49b8a2d49f69e301c035093 SHA-1: 055e99e377bb6c91252ffe53b3e2bd6eaf29ef66 SHA-256: 91b2d3eecb2d62bc97cef3bd68e30ad335a3ce545ae5cc303863457e2354b6b1
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file exhibits characteristics of a phishing lure, including being image-heavy with a click-outward action, designed to trick users into interacting with embedded content. A significant embedded file, 'embedded_file_obj0003.bin', was detected, suggesting it is the primary payload. No JavaScript or VBA scripts were extracted, and the document body was unreadable, limiting further analysis of the immediate user-facing intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4215

Heuristics 8

  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 2 image(s), only 0 text block(s), carries a click-outward action, and is only 143 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Suspicious extracted artifact medium 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 file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • 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://ocsp.verisign.com0 Referenced by PDF JavaScript
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/mm/Referenced by PDF JavaScript
    • http://purl.org/dc/elements/1.1/Referenced by PDF JavaScript
    • http://ns.adobe.com/pdf/1.3/Referenced by PDF JavaScript
    • http://ns.adobe.com/xfa/promoted-desc/Referenced by PDF JavaScript
    • http://cgi.adobe.com/special/acrobat/updateReferenced by PDF JavaScript
    • http://ns.adobe.com/xdp/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xci/1.0/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xci/2.8/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-template/2.5/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-locale-set/2.1/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-data/1.0/Referenced by PDF JavaScript
    • http://www.xfa.org/schema/xfa-form/2.8/Referenced by PDF JavaScript
    • http://crl.verisign.com/tss-ca.crl0Referenced by PDF JavaScript
    • http://crl.verisign.com/ThawteTimestampingCA.crl0Referenced by PDF JavaScript
    • https://www.verisign.com/rpaReferenced by PDF JavaScript
    • https://www.verisign.com/rpa01Referenced by PDF JavaScript
    • http://crl.verisign.com/pca3.crl0Referenced by PDF JavaScript
    • http://CSC3-2004-crl.verisign.com/CSC3-2004.crl0DReferenced by PDF JavaScript
    • https://www.verisign.com/rpa0Referenced by PDF JavaScript
    • http://CSC3-2004-aia.verisign.com/CSC3-2004-aia.cer0Referenced by PDF JavaScript
    • http://www.adobe.com/typehttp://www.adobe.com/type/legal.htmlReferenced by PDF JavaScript
    • http://ns.adobe.com/xtd/In PDF document text
    • http://ns.adobe.com/xfdf/In PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 13

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x96EA 163 bytes
SHA-256: f71bdf9c49e7bebc43f027bd189873264b901faea4fec74a84c535dbe3d73af1
embedded_file_obj0002.bin pdf-embedded-file PDF EmbeddedFile object 2 at offset 0x97DB 2006 bytes
SHA-256: d47e774f9657cf89f66fd6677716a0e8dad701c96d76b10f3829ea9afd421878
embedded_file_obj0003.bin pdf-embedded-file PDF EmbeddedFile object 3 at offset 0x9B49 181837 bytes
SHA-256: 520b467f581eafbd182e238c648c31f679d6a873b2e6a11be369fa2861ef3589
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). 1194 of 1689 identifiers look randomly generated (e.g. 'UlJSUlJSUlJSAPDw8PDw8PDwAFJSUlJSUlJSUlJS'); 1 string-concatenation chain(s) — consistent with name-mangling obfuscation.
embedded_file_obj0004.bin pdf-embedded-file PDF EmbeddedFile object 4 at offset 0x1124A 2436 bytes
SHA-256: 7e4c746142c5363dfb2147564dc0d7fabf1236273c9a924813bf104d26134ae9
embedded_file_obj0005.bin pdf-embedded-file PDF EmbeddedFile object 5 at offset 0x11547 357 bytes
SHA-256: cdd56f69a619284d1d00cccc1f44f45786ee9ac0806b8e0beaf458747fe0c5e4
embedded_file_obj0006.bin pdf-embedded-file PDF EmbeddedFile object 6 at offset 0x11660 200 bytes
SHA-256: 500856001a9edb17a299f41c8b34871c12c85d56ec8eff03ef181fca24bb96b5
embedded_file_obj0007.bin pdf-embedded-file PDF EmbeddedFile object 7 at offset 0x11754 1533 bytes
SHA-256: 9d935e95807c4a1878faf4b42599d869828a6e161658c23b6db369f82ff29295
embedded_file_obj0008.bin pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x11A16 80 bytes
SHA-256: 2ebdd7efeaa1190ff6bad8cbd649b313e3969564018f204e7385b97c2fab1e19
embedded_file_obj0009.bin pdf-embedded-file PDF EmbeddedFile object 9 at offset 0x11ABF 56 bytes
SHA-256: 4a60a9864cdf7382475d51051a03fdc43b32c31eb508893ccfccece34957f9f1
stream_002_off000004cc.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CC 1367 bytes
SHA-256: f8721569904600df33f536ddc9f4942717077f9d6c3c4253a8f4de5650fc6531
stream_003_off000006b3.js decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6B3 902 bytes
SHA-256: 91ea259764c68d27b8981a339c02d8ea92224ae5c0d0cd0a7c8f3d645d599090
objstm_0115_00.bin pdf-objstm-decoded PDF /ObjStm 115 0 obj (inflated) 7417 bytes
SHA-256: b52e3bd02d08fa99dfe2a7754213221df7d8e521fd07f72e7a0b920d6a839174
font_00_sfnt_off00011bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC4 95975 bytes
SHA-256: c29e5b1537bee8c88b3ffca56c5f24a45ec8da374cf9d4c0b4a78d04fc230949

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