Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ded4d17b0715a3…

MALICIOUS

PDF

151.1 KB Created: 2005-10-06 10:11:46 -04:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 7.0 (Windows))
MD5: 3bcffaa94b42314b1c5b9f891d3089af SHA-1: 34ce18193cbbc34c47286d95391998036ccaf883 SHA-256: 93ded4d17b0715a3572b7910d62613e0c6adc3e5d5e26c9cdc78257120ee1667
116 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript with eval() calls and uses String.fromCharCode, indicating obfuscated code execution. The presence of U3D content suggests exploitation of a 3D-related vulnerability, potentially CVE-2017-11882, to trigger the JavaScript. The script likely downloads and executes a second-stage payload. The document body was not parsable, limiting the ability to determine the specific lure.

Heuristics 9

  • U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED
    PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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.
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • 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
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • 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/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0016_035.js
fb61e7ac63adcb8b73652626f47986998cb2cae3606ea768ccf85c35ab118a60		 pdf-javascript-stream PDF /JS object 16 at offset 0x1A6A 40582 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 15 eval/decoder/string-building token(s).
stream_033_off0001a454.js
0d7deb914e097d2b8af8873f0832bbdecebbc9bc394b305b540805bdfc43be29		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A454 211379 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
u3d_00_off00019297.bin
f801c9d5e9ff9443d3affe8d334394e9107adcf570899ff3d4946cd736ee1f5c		 pdf-3d-stream PDF U3D 3D stream at offset 0x19297 14012 bytes

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