Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e23d184de2cccde…

MALICIOUS

PDF

202.3 KB Created: 2006-09-20 09:23:22 +02:00 Authoring application: Adobe Designer 7.0
MD5: 3b3390af9a6a9e3a3d5fb0db374914e0 SHA-1: 0fe962ed2780f79aa0a067b1707ba47a3e20cc61 SHA-256: 4e23d184de2cccdee0882be1918892b9b203c96287b59c88e7c4c66a86030d33
62 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1140 Deobfuscate/Decode Files or Information

The PDF file exhibits multiple indicators of malicious intent, including embedded JavaScript and an embedded file. The presence of PDF_JAVASCRIPT and PDF_EMBEDDED_SCRIPT_PAYLOAD heuristics strongly suggests that the embedded script is designed to execute code. This script likely functions as a downloader for a secondary payload, as indicated by the embedded file artifact. The overall attack pattern points towards a document-based malware delivery mechanism.

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.
  • JavaScript action low 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.
  • 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
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 13

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0571.bin
c06dcd026a7ea0536b63e07ce688691b585339a3ab7ff59065e546b56308c7bb		 pdf-embedded-file PDF EmbeddedFile object 571 at offset 0x2B632 85 bytes
embedded_file_obj0572.bin
f5dd842c110235afdc40e650ab10e3e96cfc207199e407b0eed71874ec71ed72		 pdf-embedded-file PDF EmbeddedFile object 572 at offset 0x2B6E5 1903 bytes
embedded_file_obj0573.bin
ffb15b866e173a5e67f7910fae97a6e9d47b89186b2b8207eaf8e43da97bd759		 pdf-embedded-file PDF EmbeddedFile object 573 at offset 0x2BA19 77914 bytes
embedded_file_obj0574.bin
dcb1b2cd95d78c2e850882a719c4d1f08a49ed97ea43c0b8b9fb022f5a1ea1ab		 pdf-embedded-file PDF EmbeddedFile object 574 at offset 0x2E489 3006 bytes
embedded_file_obj0575.bin
5f46a4aa50bf20cf566ff569220627bd3d337eb0f82d34eb699337756ad09c73		 pdf-embedded-file PDF EmbeddedFile object 575 at offset 0x2E6D2 2262 bytes
embedded_file_obj0576.bin
1b1d95000e2d3ad282850eac482f66ae153cd07d3c1966330accd6e87c69cd0f		 pdf-embedded-file PDF EmbeddedFile object 576 at offset 0x2E9B6 724 bytes
embedded_file_obj0577.bin
a60265344cf1a9e94da34c8f587f64a4297e2fa417c895852209903ab7588bcc		 pdf-embedded-file PDF EmbeddedFile object 577 at offset 0x2EB97 85 bytes
embedded_file_obj0578.bin
57045217c453d4674a08ad8778674bf199a7989a9505424a1815c016e6bb412f		 pdf-embedded-file PDF EmbeddedFile object 578 at offset 0x2EC43 212 bytes
javascript_obj0563_000.js
4a1aca004cf20431c9a66dce85404a6411a54d881a6c257882260ffc972a13eb		 pdf-javascript-stream PDF /JS object 563 at offset 0x2ADB0 870 bytes
javascript_obj0565_001.js
c2d25683b87f35b2c97fd55b4b4d3fb2c8e428989cc7f8de755a12031e1ce557		 pdf-javascript-stream PDF /JS object 565 at offset 0x2AF37 3843 bytes
javascript_obj0567_002.js
c876171bd867b66b7671fb337ff9e57d18cd15b43d344cf5a7243821300a408a		 pdf-javascript-stream PDF /JS object 567 at offset 0x2B324 1528 bytes
font_00_cff_off00002811.bin
96161e3d15cf67591ef2a1c87940c8dc0af59a94fcfab5d6bfcf4cb992a24af8		 pdf-font-stream PDF embedded font (cff) at offset 0x2811 64586 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.45, consistent with packed or encrypted content.
font_01_cff_off00010d93.bin
19bc268243419390efbe4d4a72616ba894a394856f2c9ca5fc68f8c8c3d28328		 pdf-font-stream PDF embedded font (cff) at offset 0x10D93 67274 bytes

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