MALICIOUS
536
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1059.007 JavaScript
T1566.001 Spearphishing Attachment
The PDF file contains a critical PDF_LAUNCH heuristic firing, indicating it attempts to execute a command. This is further supported by a PDF_LAUNCH_COMMAND firing for cmd.exe and a PDF_LAUNCH_PLUS_DROPPER_JS firing, which indicates JavaScript is used to export a data object. The embedded JavaScript explicitly calls `this.exportDataObject({ cName: "catalogo", nLaunch: 0 });`, which, combined with the launch action, is designed to execute the embedded executable disguised as 'catalogo.pdf'. The embedded artifact is detected by ClamAV as 'Win.Trojan.Small-3960', and the PDF itself is flagged as 'Pdf.Tool.Agent-1388586'.
Machine Learning
- Nyx PDF Classifier malicious score 0.9991
Heuristics 12
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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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ClamAV: Pdf.Tool.Agent-1388586 critical CLAMAV_DETECTIONClamAV detected this file as malware: Pdf.Tool.Agent-1388586
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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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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\\catalogo.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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/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 1 related finding 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://www.primopdf.com In PDF document text
- http://www.primopdf.com)/Author(OwnerIn PDF document text
Extracted artifacts 7
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
catalogo.pdf |
pdf-embedded-file | PDF EmbeddedFile object 54 at offset 0x1D320 | 10240 bytes |
SHA-256: d0a688adb9ae048f6b56e864eb712b2f21b3b4b5760201cba420307d3fe169b5 |
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Detection
ClamAV:
Win.Trojan.Small-3960
Obfuscation or payload:
likely
actual_type=PE; declared_or_context_type=PDF; filename=catalogo.pdf; kind=pdf-embedded-file Static shellcode analysis found candidate code region(s). Indicators: SC_PEB_ACCESS
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javascript_obj0055_000.js |
pdf-javascript-stream | PDF /JS object 55 at offset 0x1E798 | 57 bytes |
SHA-256: b41761703435ad3d4c93eae5dd47f47ce368f519ca0d792b48fc4d6b3122c90a |
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Preview scriptFirst 1,000 lines of the extracted script
this.exportDataObject({ cName: "catalogo", nLaunch: 0 });
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stream_007_off00013abd.bin |
decompressed-pdf-stream | PDF FlateDecoded stream at offset 0x13ABD | 37748 bytes |
SHA-256: ee8442cb4a0713786081e40ef1d0f4b7bb981b397fb7c5e84159ea205168c6cc |
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font_00_sfnt_off00011107.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x11107 | 13904 bytes |
SHA-256: 644444183b4cf9af9ea413a00e5fe47bf6eb12d0bc5503b49f2cde74f14b6835 |
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font_01_sfnt_off000123ff.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x123FF | 15228 bytes |
SHA-256: 3704e011326f5c17811369327645119f389a8c37d34fc0cea8ae5d235240fc16 |
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font_03_sfnt_off000181f0.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x181F0 | 29844 bytes |
SHA-256: c6a7886a3c717df3c9d2e595ecaa3203a35a7b75cb1da5f6aa28f97c330f3670 |
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font_04_sfnt_off0001b668.bin |
pdf-font-stream | PDF embedded font (sfnt) at offset 0x1B668 | 15640 bytes |
SHA-256: 87da220756a9d1d60d25b77325d446c8ecd992168f60a5a78b863f7ff9220d15 |
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