PDF malware analysis — malicious · 9e477f5b93ed7efa

MALICIOUS

PDF

7.4 KB Created: 2009-01-35 62:12:26 Authoring application: Adobe

MD5: 59d23950271be9a1f2b1472ee81c18cc SHA-1: 02b60268b270c0bfd4faf81ce0c40688cf92b855 SHA-256: 9e477f5b93ed7efa29e38d296b9bfb034b92f7b1fd84c3b534ca3002ee4dcce3

338 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link T1071.001 Web Protocols

The sample is a PDF file that contains multiple critical heuristic firings indicating exploitation of CVE-2009-4324, CVE-2009-0927, and CVE-2007-5659. These vulnerabilities are leveraged to execute embedded JavaScript, which is then further obfuscated and evaluated. The primary function appears to be downloading and executing a second-stage payload, as indicated by the ClamAV detection of Pdf.Dropper.Agent-7287240-0. No specific family could be confidently identified.

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-7287240-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7287240-0
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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 8

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0032_000.js` `dbecf759597cea8a2320262bee6c5122a34e0243cffbe7dd77eb453b60d1c518`	pdf-javascript-stream	PDF /JS object 32 at offset 0x424	133 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0034_001.js` `94328559edcc47441cadb1ecf730e5d8b366cb0bdc4c897f7a385698301c8122`	pdf-javascript-stream	PDF /JS object 34 at offset 0x4E3	136 bytes
`javascript_obj0036_002.js` `ff496ed662b32ce82d48076002f1ed6d28586279e9123ac2b8d52816b64ff336`	pdf-javascript-stream	PDF /JS object 36 at offset 0x107	153 bytes
`javascript_obj0038_003.js` `27ec44343443a67b823670454ba9ce61680c9646c87dfb58159e12c4106fea69`	pdf-javascript-stream	PDF /JS object 38 at offset 0xC4E	174 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0078_004.js` `6ba7616f768e68067527df2727c6524bd7a416d7499d33215405d8b9c0dda1a9`	pdf-javascript-stream	PDF /JS object 78 at offset 0x7C	45 bytes
`legacy_pdfkit_stage_000.js` `e9c7435c197b82dffbd5381ed31a475d387a8671690273b845f4c1d4ebeb36e4`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x5D8	1634 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` `73beae69d19d420bd381f184dda2bde25943daac4b29f9d6e28a00b74d42bad7`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xD87	1800 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` `cd6202bed07aae3ee9a51830674121c45dd42566cc5df4698764f7893d853110`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x13F4	2938 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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