Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e8c2c5aef7be82…

MALICIOUS

PDF

45.8 KB
MD5: 25b2a310dcb2fd0a9123595d94e4ddd4 SHA-1: c970ba7a922ab99c90277fd0934415214703006a SHA-256: 72e8c2c5aef7be82477600d96e53a3571c96be7a1ff8275fa67be723ced84a0c
170 Risk Score

Malware Insights

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

The PDF file contains obfuscated JavaScript that exploits CVE-2009-0927 using the Collab.getIcon method. This script decodes a further layer of JavaScript which contains a URL for downloading a secondary payload. The deobfuscated script explicitly calls app.doc.Collab.getIcon, indicating the exploitation of this specific vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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)
  • 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).
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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://ldoab.ru/ItuBF21PNxyDGU84axtoFdbr84x4Dmbc?p=1&x=1010&s=oldpdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
c6c42be530bdb3eccc90b2cbe84dd039fdfd690a978ef8e9d9ffdc2725e68d01		 pdf-javascript-stream PDF /JS object 8 at offset 0x1D3 9215 bytes
custom_b64_stage_000.js
bd9ded8fc71e172273a9cc68945383fd7b26ca7154a32e2c274524b16d692b5a		 deobfuscated-js custom Base64 decoded JavaScript layer 2 (PDF /JS object 8) at offset 0x8A7 1517 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).

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