PDF malware analysis — malicious · 5f6ece3cf0bb3143

MALICIOUS

PDF

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

MD5: 96dfd57ddb2a2e588459151160dd08f5 SHA-1: f9ff7e4ea101d7d9978fc6543bbadb6bd5637e07 SHA-256: 5f6ece3cf0bb3143685f17e4dd39907c2106ee286b210679570d668a57508237

228 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains multiple critical heuristic firings indicating exploitation of CVE-2009-4324, CVE-2009-0927, and CVE-2007-5659 via embedded JavaScript. The deobfuscated JavaScript in legacy_pdfkit_stage_000.js contains shellcode and attempts to leverage the `media.newPlayer` function, indicating it's designed to execute arbitrary code. The presence of multiple JavaScript streams and deobfuscated files suggests a multi-stage attack designed to download and run a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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)
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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0032_000.js` `1abb3e5584e681623f3555749c2504cfa5c055ac30fd9c9dbbe67be157c434b4`	pdf-javascript-stream	PDF /JS object 32 at offset 0x395	230 bytes
`javascript_obj0034_001.js` `51f3097a515b4d65de3bbb28bd6fd1de32aaaf85f8280d385fe49c5d9a11fd9e`	pdf-javascript-stream	PDF /JS object 34 at offset 0x47F	366 bytes
`javascript_obj0036_002.js` `46ba34e1de6836692768204c8ded7d9e95ab47afd06dbeb9c0806f6cf5eeee7c`	pdf-javascript-stream	PDF /JS object 36 at offset 0xBC	257 bytes
`legacy_pdfkit_stage_000.js` `2177691c72c7500f9286de874c9386117a49c6bfed0e841b017e890a01a99ea6`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x5E4	1544 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` `027a476bfb11f120f4511efb84985be79aa56776f3d324a08dca3c1588f363e1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xB3E	1710 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` `824b7d6ddd542bd5652b9c7fd93f818223b9095e3edf86f5fc46e2b5c69ddc4c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1079	2758 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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