PDF malware analysis — malicious · 40feb170b7f059a0

MALICIOUS

PDF

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

MD5: 474158dd36c4df7546f6dbbfd8bd10e7 SHA-1: ec1a5acff6c801574b5232013b71cfd459031316 SHA-256: 40feb170b7f059a0f7ef660bcbdd668389af9e28473e9902f176725fc6826dc5

338 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

This PDF document contains embedded JavaScript that leverages multiple critical vulnerabilities (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659) to execute code. The JavaScript uses eval() and unescape() functions, indicating obfuscation and a likely attempt to download and execute a secondary payload, as suggested by the ClamAV detection of 'Js.Exploit.Shellcode-18'. The extracted 'legacy_pdfkit_stage_000.js' file is large and likely contains the malicious logic.

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 detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0032_000.js` `ccf9b35630460caa20b5e67aba6a9caa7f640cfe105569057117d6ee1932a458`	pdf-javascript-stream	PDF /JS object 32 at offset 0x3EB	186 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0034_001.js` `5edb071aaac4b7d9540d433696615b21f32987806c71fafed09765c9ee87d7a8`	pdf-javascript-stream	PDF /JS object 34 at offset 0x4DA	134 bytes
`javascript_obj0036_002.js` `9846fab6244ac40fb775f742829cff45a05ff956003c4414d16dcc353702ca2f`	pdf-javascript-stream	PDF /JS object 36 at offset 0xF7	140 bytes
`javascript_obj0038_003.js` `a6e78788f334d45802cddd08ed908da57c60b6b427e1519a7fe7117bcaf701f3`	pdf-javascript-stream	PDF /JS object 38 at offset 0x1423	180 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0078_004.js` `6b1ac6e219f5a584a011d9a1be08bcfd071c7748b83c20e93fe560c489eb01d2`	pdf-javascript-stream	PDF /JS object 78 at offset 0x73	48 bytes
`legacy_pdfkit_stage_000.js` `d63784f082e9abadc5b287ba7c481d7e10e9dc0da883c19dc1c74f3ad5a7c680`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x5C6	6411 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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