Malware Insights
The PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-4324, CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. These vulnerabilities are associated with the execution of embedded JavaScript. The presence of deobfuscated JavaScript streams further supports this, with one stream named 'legacy_pdfkit_stage_000.js' suggesting it's part of a known exploit kit. ClamAV detections on both the main file and extracted artifacts confirm its malicious nature. The primary attack vector appears to be leveraging these PDF exploits to run malicious scripts, likely for further payload delivery.
Heuristics 9
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media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324PDF 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)
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Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927PDF 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)
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Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659PDF 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)
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util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
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ClamAV: Pdf.Exploit.Agent-36307 critical CLAMAV_DETECTIONClamAV detected this file as malware: Pdf.Exploit.Agent-36307
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ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAVClamAV 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.
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JavaScript action low PDF_JAVASCRIPTPDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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Embedded JS stream low PDF_JSPDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGEOne 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 3
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
javascript_obj0008_000.js744fcc1eccc82daeb9d3968ae0aea3f3f74b7d0a1741f0a52c23931b21874b2c |
pdf-javascript-stream | PDF /JS object 8 at offset 0x1E7 | 5372 bytes |
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Detection
ClamAV:
Pdf.Exploit.Agent-36307
Obfuscation or payload:
unlikely
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legacy_pdfkit_stage_000.js3bcedca2c66fb84203e503c780b58325fb8afd03d2b8c99783cce2b6fba5abf5 |
deobfuscated-js | repeated-marker hex decoded JavaScript at offset 0x1717 | 6032 bytes |
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Detection
ClamAV:
Js.Exploit.Shellcode-18
Obfuscation or payload:
likely
Carved artifact contains 11 eval/decoder/string-building token(s).
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legacy_pdfkit_stage_001.js42025b552c7960b53abcd8cd732b01c8d109eccfdfefc352b9826c4d5807d414 |
deobfuscated-js | cross-stage annotation API aliases at offset 0x1E7 | 81 bytes |
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