PDF malware analysis — malicious · 170b002d560cfeb5

MALICIOUS

PDF

6.3 KB Created: 2009-01-35 62:12:26 Authoring application: Chat

MD5: 49e45b6e44272500fbca91a0e6b9a655 SHA-1: f449a3b9f32382f81cf7cf6205cf89dee021d962 SHA-256: 170b002d560cfeb5da8f269186cca421296d3c66ca3ca43da8b89690c6107396

270 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains multiple critical heuristic firings indicating exploitation of CVE-2009-4324, CVE-2009-0927, and CVE-2007-5659. These vulnerabilities are leveraged by embedded JavaScript to download and execute a second-stage payload from the provided URLs. The deobfuscated JavaScript confirms the intent to download from 'http://uplevelgmno.vn.ua/111/sv777/load.php?spl=pdf_new' or 'http://uplevelgmno.vn.ua/111/sv777/load.php?spl=pdf_pack'.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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)
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).
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://uplevelgmno.vn.ua/111/sv777/load.php?spl=pdf_new
- http://uplevelgmno.vn.ua/111/sv777/load.php?spl=pdf_pack

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0032_000.js` `b1791e73bfa7c280778f91a2ead00cbfbeb2cf188b5f0fa33718c0d7c386c70a`	pdf-javascript-stream	PDF /JS object 32 at offset 0x3AA	235 bytes
`javascript_obj0034_001.js` `ff6f2fb51516a8de3ecc900014307255c322435306040d6134deddccb5371763`	pdf-javascript-stream	PDF /JS object 34 at offset 0x499	406 bytes
`javascript_obj0036_002.js` `9dffabbcb1ee2368cb59fce8b44785310d28b2b395d8d1e8de1576dfb485a655`	pdf-javascript-stream	PDF /JS object 36 at offset 0xBC	287 bytes
`legacy_pdfkit_stage_000.js` `32c8ccc02d7b8a3d45089d22352f16e98cae607864d481b60ddf9482d144e320`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x603	1676 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `2b715017cc3e176aff72cc16fd2663f4ac29909b5f09dc353e93ce48c1a54a1c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xBB9	1836 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_002.js` `f560041f1cf22c93255bd90dba465c5a79c20a98cf744b26545ad4620338434a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x114C	3010 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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