Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be7138940c10f67…

MALICIOUS

PDF

46.4 KB
MD5: 32842fbbc005a6fc3894d926bce64d86 SHA-1: 0700c8f58de0e835db766648573db8535a1f1f45 SHA-256: 0be7138940c10f67265a5d557700e7f914a9ac0df0c3b3c9fb5ff5f850314133
170 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that exploits CVE-2009-0927 using the Collab.getIcon method. This JavaScript is obfuscated and decodes further layers, ultimately leading to the download of a second-stage payload from the URL http://somev.ru/fm5ruk4lllnoei1ukftbgcfekz826aua?p=3d1&s=3doldpdf&s=oldpdf. The ML classifier also strongly indicates maliciousness.

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://somev.ru/fm5ruk4lllnoei1ukftbgcfekz826aua?p=3d1&s=3doldpdf&s=oldpdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
a20a5d94ffd719f4f8d811b6977c22a7ccd57998c72205f493d32e31f8281dde		 pdf-javascript-stream PDF /JS object 8 at offset 0x1D3 9339 bytes
custom_b64_stage_000.js
cddc42b41955b8f39990340596445764315d7b9c6b53374ff80cc2519678806a		 deobfuscated-js custom Base64 decoded JavaScript layer 2 (PDF /JS object 8) at offset 0x8A7 1547 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).

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