PDF malware analysis — malicious · 0da0de3a8b9a7cfe

MALICIOUS

PDF

45.8 KB

MD5: c962265fb2d2f2bd2f81b1e503f15a3c SHA-1: 0f183909535be5f346e959ad27aaa08068cfc674 SHA-256: 0da0de3a8b9a7cfe6dc5b20cd58bcd582a4409c554d4ae492d7ae01410437ffd

170 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains embedded JavaScript that exploits CVE-2009-0927 using the Collab.getIcon method. This JavaScript is obfuscated and decodes a second layer of JavaScript, which in turn contains a URL to download a shellcode payload. The deobfuscated script explicitly calls app.doc.Collab.getIcon, confirming the exploit vector. The primary purpose is to download and execute a malicious payload from the identified URL.

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://rnpo.ru/ItuBF21PNxyDGU84axtoFdbr84x4Dmbc?p=1&x=1000&s=oldpdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `15835cb836ed68d5c5811dac12b5557b4f719c20dd7f704bd1740308522fc107`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1D3	9215 bytes
`custom_b64_stage_000.js` `c6dcef5c8cf14db90818ef99f71725b89adde8978087acafe71ebd4fd8b1569f`	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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