PDF malware analysis — malicious · 7323bc9eb04c9915

MALICIOUS

PDF

1.95 MB Created: 2009-01-35 62:12:26 Authoring application: Adobe

MD5: 64f5c74b337a98c8b44f50933ac42176 SHA-1: e3953da0b17e8e1e5a18dc56e11cf99091a10d80 SHA-256: 7323bc9eb04c991530e2dfb235cd7d912aa830c9033a1e8b4ab4c92f5a74cefb

330 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file that leverages multiple known vulnerabilities (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659) to execute embedded JavaScript. This JavaScript is designed to download and execute a second-stage payload from the URLs http://eivom3d.ru/flash/load.php?spl=pdf_new and http://eivom3d.ru/flash/load.php?spl=pdf_pack. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 9

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)
ClamAV: Pdf.Dropper.Agent-1551404 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1551404
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://eivom3d.ru/flash/load.php?spl=pdf_new
- http://eivom3d.ru/flash/load.php?spl=pdf_pack

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0032_000.js` `b488471d21ac0b2165805b66a62f38df30673907105cfa8a9a2e0a06154a5a82`	pdf-javascript-stream	PDF /JS object 32 at offset 0x342	269 bytes
`javascript_obj0034_001.js` `cd37960beb7e09857196723b2d57ec8b02ef226ff84f58dd6695b9409fad4e81`	pdf-javascript-stream	PDF /JS object 34 at offset 0x434	325 bytes
`javascript_obj0036_002.js` `a093c9b9e40994a12aeb546b49596039b032b18fe7ac55e382a371611e73870d`	pdf-javascript-stream	PDF /JS object 36 at offset 0xBC	224 bytes
`legacy_pdfkit_stage_000.js` `58e428137e7034683c38adcd5e62481706aed675b452db0650e5f8c4ed51d641`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x572	1640 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` `5f585e3d073227f2aaefc706e339dcc1347cd47b1f64f7493c91277251c10f33`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xB0B	1806 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` `771c5d2a9ff95552bf92388bf715f9acd0f4f8fb6dbae06452a8e11d3cff7bbe`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1087	2950 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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