PDF / .RU_ malware analysis — malicious · 57a04e131be8d35f

MALICIOUS

PDF / .RU_

10.4 KB Authoring application: d9c47Fotinocp

MD5: bba7a9dca998e45fd4b0bd8075c3c090 SHA-1: df62f7a5e9de8c9142e1488b9093df96b1d23a6d SHA-256: 57a04e131be8d35ff412bd5d3fad66400bbdb2676279cf77aa239ed169a6bf9c

298 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that is XOR-decoded and evaluated using multiple known CVE exploits (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, CVE-2008-2992). The 'OpenAction' trigger and the presence of obfuscated JavaScript streams indicate that the primary goal is to execute malicious code upon opening the PDF. The deobfuscated JavaScript likely serves as a downloader for further stages.

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)
util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
OpenAction trigger high PDF_OPENACTION

PDF has an /OpenAction — code runs automatically when opened
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0018_000.js` `28e126fd681bb67841458ad412d44aff51def35b562ce673729a588d3a4c3fc2`	pdf-javascript-stream	PDF /JS object 18 at offset 0x1A8B	4590 bytes
`page_word_xor_stage_000.js` `ee29a91a5fc99afca9ff19ff83d932f29d2a657214e9f0c2726decd2a9dfda13`	deobfuscated-js	page-word XOR decoded JavaScript (decompressed, key=0x7B) at offset 0x7AB	3049 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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