Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c962ddc3077aa7…

MALICIOUS

PDF

12.0 KB Created: 2010-07-25 10:32:51
MD5: 6dfe67637fdde0cd473d742fc0ec15cd SHA-1: aeb78ffd7c0a4cb129d12cd40fa0664c976d4893 SHA-256: 65c962ddc3077aa7c5d2ad0255d03b821eb85f51796cb4ca5027ff5bf24a99a7
388 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that leverages multiple Adobe Reader vulnerabilities (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) to execute arbitrary code. The deobfuscated JavaScript appears to be a stager designed to download and execute a secondary payload, indicated by the large obfuscated string and the use of functions like `unescape` and `String.fromCharCode` to construct executable code.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 9

  • 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)
  • util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992
    PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (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.
  • PDF /Producer character-range JavaScript stager high PDF_INFO_PRODUCER_CHAR_RANGE_JS_STAGER
    PDF metadata hides JavaScript in /Producer as character ranges plus a long numeric index table. The document JavaScript rebuilds an alphabet from those ranges, maps the indexes into characters, and evals the recovered exploit stage. The decoder is bounded and only fires when the recovered stage contains exploit-like Acrobat JavaScript.
  • 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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
2f28724496bb5670771bc335b3dfdbeedf591598c788efeb602bd6e29cb357ec		 pdf-javascript-stream PDF /JS object 7 at offset 0x2C9A 449 bytes
javascript_obj0007_001.js
fe32e1cc753c09dd1ce2d3435807d959daf1027b5dca273bdbaa81937be4adc9		 pdf-javascript-stream PDF /JS object 7 at offset 0x2C9A 101 bytes
producer_char_range_stage_000.js
e1966ce6b8f21e2447ff47507f731d674eac3be3b7670aae4ae22b1b8b7fab5e		 deobfuscated-js PDF /Info Producer char-range indexed JavaScript at offset 0x19A 3643 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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