Malicious PDF — malware analysis report

Static analysis result for SHA-256 782ac8455a19ef40…

MALICIOUS

PDF

6.1 KB Created: 2009-01-35 62:12:26 Authoring application: Adobe
MD5: 550506357d12d2594ebd0f165d0c05b6 SHA-1: 39b343e0048e100d6b41372bab910868f9fe13fc SHA-256: 782ac8455a19ef40f4027d106edf9546c7a7851749158606cdab90028e1b530b
270 Risk Score

Malware Insights

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

The PDF sample contains multiple critical heuristic firings indicating exploitation of CVE-2009-4324, CVE-2009-0927, and CVE-2007-5659. The embedded JavaScript, specifically in legacy_pdfkit_stage_000.js, contains shellcode that attempts to download a payload from the URLs http://eivom3d.ru/flash/load.php?spl=pdf_new and http://eivom3d.ru/flash/load.php?spl=pdf_pack. This indicates a downloader functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 8

  • 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)
  • 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://eivom3d.ru/flash/load.php?spl=pdf_new
    • http://eivom3d.ru/flash/load.php?spl=pdf_pack

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0032_000.js
91ee186ead7753ba111a4d8ec893cec1b6821f26cf0dc2ebb0c3572fac65f6af		 pdf-javascript-stream PDF /JS object 32 at offset 0x366 278 bytes
javascript_obj0034_001.js
8c6974162602902b2806aea890aa8a134242c79af2f217fc156aa9eec23f0f4a		 pdf-javascript-stream PDF /JS object 34 at offset 0x466 415 bytes
javascript_obj0036_002.js
d9bf5fbf6062fe844a97038661cab12cadf174fe2d84f429ba3a7eafb1db5f17		 pdf-javascript-stream PDF /JS object 36 at offset 0xBC 278 bytes
legacy_pdfkit_stage_000.js
58e428137e7034683c38adcd5e62481706aed675b452db0650e5f8c4ed51d641		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x5B7 1640 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
legacy_pdfkit_stage_001.js
5f585e3d073227f2aaefc706e339dcc1347cd47b1f64f7493c91277251c10f33		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xB50 1806 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
legacy_pdfkit_stage_002.js
771c5d2a9ff95552bf92388bf715f9acd0f4f8fb6dbae06452a8e11d3cff7bbe		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x10CC 2950 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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