MALICIOUS
166
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 JavaScript/Shell Scripting: JavaScript
T1204.001 Malicious Link/URL: Malicious Link
T1204.002 Malicious Link/URL: Malicious File
This PDF file contains embedded JavaScript that is designed to exploit CVE-2007-5659 in Adobe Reader. The JavaScript uses eval() and String.fromCharCode() to deobfuscate and execute a malicious payload. The ML classifier strongly indicates maliciousness, and the presence of obfuscated JavaScript streams further supports this. The primary attack vector appears to be exploiting a known Adobe Reader vulnerability to achieve arbitrary code execution.
Machine Learning
- Nyx PDF Classifier malicious score 0.9999
Heuristics 9
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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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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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Embedded file low PDF_EMBEDDEDPDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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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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Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTALThe same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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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.
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Embedded URL info EMBEDDED_URLOne or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/iX/1.0/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
Extracted artifacts 2
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
javascript_obj0016_000.js3410fb260fb5dff3602dcc80a532e84edbca82553d1daa0fc3222c1624a5eed5 |
pdf-javascript-stream | PDF /JS object 16 at offset 0x931 | 7066 bytes |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
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legacy_pdfkit_stage_000.js87d3cb82c8fcf355fc35bccd117771919e2776c7d3ca75201e64158e81bcfd89 |
deobfuscated-js | CRC32 callee-key hex decoded JavaScript at offset 0x931 | 2560 bytes |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 3 eval/decoder/string-building token(s).
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