Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e85419088c8bab3…

MALICIOUS

PDF

4.5 KB Created: 2008-09-24 19:47:56 Authoring application: Adobe
MD5: de9ec8e8b76390262d3574ae68cad528 SHA-1: 1dfa816ffa2801039fdf827e584597fd2c990644 SHA-256: 6e85419088c8bab375e6f8a747d593aa7c7e2379be500d6e1348c6fec9d22465
510 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 Adobe Reader vulnerabilities. The deobfuscated JavaScript in 'legacy_pdfkit_stage_000.js' contains shellcode and embedded URLs pointing to 'http://homesiteuk.com//load.php?spl=pdf_0day' and 'http://homesiteuk.com//load.php?spl=pdf_pack', which are likely used to download and execute a secondary payload. ClamAV also detected this file as 'Pdf.Dropper.Agent-7270700-0'.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 12

  • 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: Pdf.Dropper.Agent-7270700-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7270700-0
  • 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://homesiteuk.com//load.php?spl=pdf_0day
    • http://homesiteuk.com//load.php?spl=pdf_pack

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0006_000.js
daa8624ada451e4d8acb6edc2cbae2ec46e3ec10a0caddd3d5402fc964e8bf7f
pdf-javascript-stream PDF /JS object 6 at offset 0xD78 205 bytes
javascript_obj0016_001.js
a013c301f8f4171f23af496f98a43b217d4cb47e4e17b47eda4be21c5977b13a
pdf-javascript-stream PDF /JS object 16 at offset 0xE4F 159 bytes
javascript_obj0026_002.js
f330153aafe681bc9733b4d8637c1a83ebd1d1e1dc01a1f57d39bb691a8df774
pdf-javascript-stream PDF /JS object 26 at offset 0xF1B 67 bytes
legacy_pdfkit_stage_000.js
e8b6ce8d5b7b485e6dd397776b6378f3b5e7360fd9127f36ef2d78b2c830f84f
deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x1BB 6129 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).