MALICIOUS
346
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1204.001 Malicious Link
T1204.002 Malicious File
The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode() functions, along with custom Base64 decoding, to execute exploit code. Critical heuristics indicate exploitation of CVE-2009-0927 (Collab.getIcon), CVE-2007-5659 (Collab.collectEmailInfo), and CVE-2008-2992 (util.printf). An extracted artifact, 'custom_b64_stage_000.js', was detected by ClamAV as 'Js.Exploit.Shellcode-18', suggesting it's a shellcode loader. The primary attack vector is the exploitation of Adobe Reader vulnerabilities through the malicious JavaScript.
Heuristics 10
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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 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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OpenAction trigger high PDF_OPENACTIONPDF has an /OpenAction — code runs automatically when opened
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eval() call high PDF_EVALeval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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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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String.fromCharCode low PDF_FROMCHARCODEString.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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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_obj0009_000.js551bd73b9554e056c9efa35d05a72cdd26e7d7c1fba6f0d3812ef73884840020 |
pdf-javascript-stream | PDF /JS object 9 at offset 0xD6 | 19700 bytes |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
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custom_b64_stage_000.jsf64153596edbd02b1cc06a881170101f69009e5af22ea829bc196ce99074eed3 |
deobfuscated-js | custom Base64 decoded JavaScript layer 2 (PDF /JS object 9) at offset 0x436 | 10575 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).
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