Malicious PDF — malware analysis report

Static analysis result for SHA-256 100e83b28246c79a…

MALICIOUS

PDF

5.3 KB Created: 2010-02-13 09:02:45 Authoring application: abc3fb
MD5: a60dcbfaf1ebd2a882c4fd923ef29865 SHA-1: 0f94686cc596848dbcd693d3ab3bf82752442686 SHA-256: 100e83b28246c79a1c4c453784009d6cf38900ed7e2546e2769b79f7a0b9068b
450 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that exploits multiple known vulnerabilities in Adobe Reader. The JavaScript is designed to download a second-stage payload from the URLs http://badboysss.net//GPvEU-l.php/cc494b7d97dc3b6656f36ae696811aaa?spl=pdf_new and http://badboysss.net//GPvEU-l.php/cc494b7d97dc3b6656f36ae696811aaa?spl=pdf_pack. This is further confirmed by ClamAV detection of 'Js.Exploit.Shellcode-18' on an extracted artifact.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 11

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
  • Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927
    PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
  • Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659
    PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
  • Pidief-style multi-CVE JavaScript dispatcher critical CVE likely PDF_PIDIEF_MULTI_CVE_DISPATCH
    A single JavaScript body branches on app.viewerVersion and invokes two or more of the canonical Reader sinks (Collab.collectEmailInfo, Collab.getIcon, util.printf with a field-width format string). This is the 2009-2010 Pidief.J multi-exploit landing template: a per-version dispatcher that fires the matching CVE chain for whichever Reader version opens the file.
  • Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KIT
    One recovered JavaScript stage contains multiple version-gated Adobe Reader exploit branches. This is stronger evidence than independent API keywords: the PDF is selecting old Reader vulnerabilities by viewer version and running heap-sprayed Acrobat JavaScript exploit paths.
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL
    Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
  • 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.
  • 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://badboysss.net//GPvEU-l.php/cc494b7d97dc3b6656f36ae696811aaa?spl=pdf_new
    • http://badboysss.net//GPvEU-l.php/cc494b7d97dc3b6656f36ae696811aaa?spl=pdf_pack

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0014_000.js
7ae452882048c3728496688a040e1588581718d51f024cac897806da2d757fe2		 pdf-javascript-stream PDF /JS object 14 at offset 0x1B8 419 bytes
legacy_pdfkit_stage_000.js
46d2ca7eef960e828041c8b1070c70c0445bdf4dc01c5fe9569556d3f45c3b06		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x3FA 7614 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 15 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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