MALICIOUS
576
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1566.001 Spearphishing Attachment
T1059.007 JavaScript
The PDF file contains embedded JavaScript that leverages a known vulnerability (CVE-2010-1240) to launch cmd.exe. This script then attempts to export an embedded file named 'ruby1.pdf', which is actually a Windows executable. The embedded executable likely acts as a downloader for further malicious activity, indicated by the numerous URLs pointing to a local IP address for various data exfiltration functions.
Machine Learning
- Nyx PDF Classifier malicious score 1.0000
Heuristics 14
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Adobe Reader Launch action command execution critical CVE exact CVE_2010_1240PDF uses the Adobe Reader/Acrobat Launch action pattern associated with CVE-2010-1240: cmd.exe is invoked with attacker-controlled parameters, paired with an embedded/exported payload.
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Launch action critical PDF_LAUNCHPDF contains a /Launch action whose target is an executable, URL, or UNC path — can start an external application
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PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTERPDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOADPDF stream bytes contain an embedded Windows executable with a verified PE header. Exploit chains often hide droppers inside ordinary streams rather than standard /EmbeddedFile attachments.
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/Launch action target: cmd.exe critical PDF_LAUNCH_COMMANDPDF /Launch action specifies an executable target with parameters '/Q /C %HOMEDRIVE%&cd %HOMEPATH%&(if exist "Desktop\\ruby1.pdf" (cd "Desktop"' — references a known-dangerous executable (cmd, PowerShell, etc.).
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Embedded attachment masquerades: declared document, content is windows-executable critical PDF_EMBEDDED_FILESPEC_CONTENT_MISMATCHAn /EmbeddedFile attachment's declared filename extension or /Subtype MIME type contradicts the magic bytes of its decompressed content. The attachment is declared as a benign document or image but the bytes are an executable or executable-bearing archive. This is a deliberate deception used to hide droppers in PDF attachments and is a generic indicator of embed-and-drop weaponisation, independent of any specific CVE.
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ClamAV: Pdf.Tool.Agent-1388586 critical CLAMAV_DETECTIONClamAV detected this file as malware: Pdf.Tool.Agent-1388586
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unescape() call high PDF_UNESCAPEunescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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/Launch action paired with attachment-dropping JS API high PDF_LAUNCH_PLUS_DROPPER_JSPDF combines a /Launch action with a JavaScript API call that writes or opens an attached/external resource — the canonical shape of the CVE-2010-1240 /Launch + exportDataObject family. Benign PDFs do not pair these surfaces; the combination indicates a drop-and-execute chain regardless of the specific JS API knobs or /Launch target.
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Suspicious extracted artifact medium 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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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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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://10.0.2.15:3000/dig_configs/get_config_file
- http://10.0.2.15:3000/key_loggers/create
- http://10.0.2.15:3000/dig_configs/get_keylogger
- http://10.0.2.15:3000/screen_caps/create
- http://10.0.2.15:3000/dig_configs/get_screencapture
- http://10.0.2.15:3000/browsing_histories/create
- http://10.0.2.15:3000/dig_configs/get_regbrow
- http://10.0.2.15:3000/audio_caps/create
- http://10.0.2.15:3000/dig_configs/get_audiocapture
- http://10.0.2.15:3000/dig_results/create
- http://10.0.2.15:3000/dig_configs/get_emailpst
- http://10.0.2.15:3000/dig_configs/get_emaildbx
- http://10.0.2.15:3000/dig_configs/get_basicsearch
- http://10.0.2.15:3000/dig_configs/get_deleted
- http://www.monotype.comhttp://www.monotype.com/html/type/license.html
- http://www.monotype.com/html/mtname/ms_timesnewroman.htmlhttp://www.monotype.com/html/mtname/ms_welcome.htmlNOTIFICATION
Extracted artifacts 3
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
ruby1.pdf0a5a5f9c8aac3eda6320d76c9d14e87554d1680ec368c9a6f89087f9baa44160 |
pdf-embedded-file | PDF EmbeddedFile object 31 at offset 0xDA43 | 103768 bytes |
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Detection
ClamAV:
No threats found
Obfuscation or payload:
likely
Carved artifact contains 3 shell/COM execution token(s).
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javascript_obj0032_000.js349efcf064a41a95f46f46b520b89c9b90bd952954914bdd1798c27a1bd4c078 |
pdf-javascript-stream | PDF /JS object 32 at offset 0x1696B | 54 bytes |
font_00_sfnt_off00004113.bin763524aa5a505a5d2884888764077a23e50a19924a9e58c041196ca73195da15 |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x4113 | 55028 bytes |
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