Malicious PDF — malware analysis report

Static analysis result for SHA-256 068508f59552957b…

MALICIOUS

PDF

29.4 KB Created: 2012-09-17 23:33:20 +04:00 Authoring application: Adobe Acrobat 10.0 (via Acrobat Web Capture 10.0)
MD5: 4a226295bbe8011275a2e9337d918373 SHA-1: de69fc70fab1271df38d93321a7eeba5bd4fa737 SHA-256: 068508f59552957b94266803fd68a8318c82845baa5f5c5e9e2e38e8bbcd3271
558 Risk Score

Malware Insights

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

This PDF file contains JavaScript that exploits multiple known vulnerabilities (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) to download and execute a second-stage payload. The embedded JavaScript stager reconstructs a URL for the payload download. The primary IOC is the download URL found within the deobfuscated JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 14

  • 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 JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • ClamAV: Pdf.Exploit.Blackhole-71 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Blackhole-71
  • Base-N pair JavaScript stager high PDF_BASE_N_PAIR_JS_STAGER
    PDF JavaScript stores a long payload as character pairs decoded with parseInt(radix) and String.fromCharCode, then evals the result. The decoder only handles bounded pair tables and only fires when the recovered stage contains exploit-like JavaScript.
  • 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.
  • 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.
  • 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/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/
    • http://hotwebcaption.servepics.com/analytics/except/year_chips_discs_special.php?cphd=1o:30:30:1l:2w&soif=1g:32:1j:1f:1m:1n:1l:1n:30:1j&vygwxqd=1h&olk=citvjal&etqgcx=csxbbx
    • http://hotwebcaption.servepics.com/analytics/except/year_chips_discs_special.php?wvy=1o:30:30:1l:2w&aetvmuty=1j:2w:1o:2v:1m:1m:33:1n:1j:31&hjc=1h&jdcguxl=oekxpe&uiqzom=hzypf
    • http://hotwebcaption.servepics.com/analytics/except/year_chips_discs_special.php?ntxf=1o:30:30:1l:2w&mbgw=1g:33:1f:1k:1k:1l:33:1g:33:1h&uldzrzrw=1h&cdhdxtb=pzmyctst&obrwd=xffpyrd
    • http://www.iec.ch

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0019_000.js
857ed5e560acc48333a725d991c00ec1c64343d50ea65d1ebe0a2d26ec7f52f9		 pdf-javascript-stream PDF /JS object 19 at offset 0x487 16901 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).
base_n_pair_stage_000.js
11b751266b24f223f76d9308b7d5c602e30b22889018ce6375ca629d45d7bae9		 deobfuscated-js base-31 pair decoded JavaScript at offset 0x48B 5283 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).
icc_00_off00005115.icc
653b586c4707574ffcd648ba35494daed2c76ceafcf4c07d315ed961b1dc347f		 pdf-icc-profile PDF ICC profile at offset 0x5115 408 bytes
icc_01_off000053b0.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0x53B0 3144 bytes

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