MALICIOUS
388
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1204.001 Malicious Link
T1059.007 JavaScript
This PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-0927 (Collab.getIcon), CVE-2007-5659 (Collab.collectEmailInfo), and CVE-2008-2992 (util.printf). These exploits are delivered via a JavaScript stager, which is heavily obfuscated using quoted-hex fragments. The deobfuscated JavaScript is likely responsible for downloading and executing a second-stage payload. ClamAV also detected the file as Pdf.Dropper.Agent-7212336-0 and an extracted JavaScript artifact as Js.Exploit.Shellcode-18.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 9
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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.Dropper.Agent-7212336-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Pdf.Dropper.Agent-7212336-0
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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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Quoted-hex fragment JavaScript stager high PDF_QUOTED_HEX_FRAGMENT_JS_STAGERPDF JavaScript stores the hidden exploit stage as many quoted hexadecimal fragments, joins them through helper functions, and evals the recovered JavaScript. The decoder is bounded and only fires when the recovered stage contains concrete Acrobat exploit APIs or heap-spray shellcode markers.
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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 2
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
javascript_obj0013_000.js639705f239237fc770069937c71e76267c085829de2238859b2d95a413ec98a1 |
pdf-javascript-stream | PDF /JS object 13 at offset 0x336 | 28809 bytes |
quoted_hex_fragment_stage_000.js9b46bf95865f38cf216a2aefe85e67533d10e0e9470a7b6cba591e50a24f36ab |
deobfuscated-js | quoted-hex fragment decoded JavaScript object 13 at offset 0x409 | 5447 bytes |
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Detection
ClamAV:
Js.Exploit.Shellcode-18
Obfuscation or payload:
likely
Carved artifact contains 9 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
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