PDF malware analysis — malicious · ef31ccf28d815f78

MALICIOUS

PDF

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

MD5: 52ccd4e9eb90afe23bf2e654eaa17662 SHA-1: 6dea084d369d1deaf27d6ec9a797987ee0a83bc1 SHA-256: ef31ccf28d815f7885fc3c402d765139015de737165f1e9e0a7f3d1688c2194e

338 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF file exhibits multiple critical heuristic firings related to known vulnerabilities (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659) that are used to execute embedded JavaScript. The JavaScript streams, particularly the deobfuscated ones, likely contain code to download and execute a secondary payload. The ClamAV detection of 'Pdf.Dropper.Agent-7321771-0' further supports its malicious nature as a dropper.

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-7321771-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7321771-0
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` `4110ffbb6393a7eb4b8d5665de22341eb069fa1d7f046c6af15552007ec80083`	pdf-javascript-stream	PDF /JS object 32 at offset 0x411	127 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0034_001.js` `428fb41610429eebeb216af041f8e49ce0bc27e011b5e312b1d8cb9dd516f7e0`	pdf-javascript-stream	PDF /JS object 34 at offset 0x4C9	118 bytes
`javascript_obj0036_002.js` `da9f2c9ede00d2fa841ad25af7453d91280a71d47b3ec8bd9c13aec51f5615c7`	pdf-javascript-stream	PDF /JS object 36 at offset 0xFB	123 bytes
`javascript_obj0038_003.js` `5acd688a048d48ce5f089897229b5b557c87390ee4d94c4fa0bb4ce5516774dd`	pdf-javascript-stream	PDF /JS object 38 at offset 0xC27	150 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0078_004.js` `5b2b23a19ec6ad263b9ff5827efb478f47252bf877c638b4836a612642d5f196`	pdf-javascript-stream	PDF /JS object 78 at offset 0x7C	33 bytes
`legacy_pdfkit_stage_000.js` `2faa476bc3932d84cbbf1f23917aa82569e603a7f89a0d6a6d1a6d0c9f120495`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x5B1	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` `542981eaf561b8acce205e96fb80ebe4860f153850682603a78ea630e2e6b535`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0xD47	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` `d4ab2b69aa30d2a48335a29ee8fe0b797d8134f54b48eec80be1db31ef8707d1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x13B4	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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