PDF malware analysis — malicious · 157bf7ddd4804d48

MALICIOUS

PDF

45.4 KB

MD5: ebac940655099d8dd13605e8c1b42b86 SHA-1: abe9509d0d35bcb1ddaa756a385cf432ca13f247 SHA-256: 157bf7ddd4804d48815079d33ee379a4e0819cebd4978b99f263892ebf3f01a9

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 is designed to download and execute a second-stage payload from the URL http://dopsh.ru/CfMZZI4AoYJdSgClHV7ZeJMgkS17oBuR?p=1&s=oldpdf. The ML classifier strongly indicates maliciousness, and the exploit technique is clearly identified.

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://dopsh.ru/CfMZZI4AoYJdSgClHV7ZeJMgkS17oBuR?p=1&s=oldpdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `5479799f805325859b1b887d3db6c751aa5bb076c447135c1a087ac9a8d74360`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1D3	9143 bytes
`custom_b64_stage_000.js` `112145d6a8767e1eac6f970ed71874f9553f08777b35d86355929b9f2f583001`	deobfuscated-js	custom Base64 decoded JavaScript layer 2 (PDF /JS object 8) at offset 0x8A7	1499 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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