Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d8a68d669ffed5…

MALICIOUS

PDF

4.4 KB Created: 2010-04-23 06:59:32 Authoring application: Dakmiyfomimaba
MD5: 29eadfa0b9d6856e611df1fcb9b2bc41 SHA-1: 315c2ce3696fff692a1f6c8ff193ff6905c8fb73 SHA-256: 82d8a68d669ffed5d38872bed9366f204c64e0c1a9b251107b872d399f9acfa0
508 Risk Score

Malware Insights

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

The PDF file contains multiple critical heuristic firings indicating exploitation of several Adobe Reader vulnerabilities, specifically CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. The embedded JavaScript, which is XOR-decoded and obfuscated, is designed to download a second-stage payload. The URL for this payload is constructed by encoding the document's author metadata, resulting in the IOC 'http://www.damihfigaso.com/Ubzg1QUbzuzgUbRjvcUb14RjUb141TUbzs1AUb1szgUb1z1vUb1j1jUb1A1zUbRT1:UbzR1jUbRj1zUbzgzvUbzg14UbRjzvUb1j1AUb1g14UbzuRTUbzu1QUbzvvjUb1AzuUbzuvMUb111gUbvR:jUbvvvuUbuuvu'. This indicates a dropper functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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)
  • 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.
  • 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-7277898-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7277898-0
  • Page-word XOR JavaScript eval stager high PDF_PAGE_WORD_XOR_EVAL_STAGER
    PDF JavaScript enumerates rendered page words with getPageNthWord/getPageNumWords, extracts encoded byte fragments, XOR-decodes the stage with char-code helpers, and evals the result. This is an old exploit-kit staging pattern and is not normal document 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0010_000.js
77692aa6eee912f470430c71119e8b9c8ba346a577cd63ae147470c7ef4ca3c3		 pdf-javascript-stream PDF /JS object 10 at offset 0xC9D 896 bytes
page_word_xor_stage_000.js
009907e2b904c7df94690bc60187233b0e5a9a0b07112466b68991827369fb42		 deobfuscated-js page-word hex-tail XOR decoded JavaScript (decompressed, key=0xD6) at offset 0x24B 3194 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s).

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