PDF malware analysis — malicious · 641bb48ddbd792bb

MALICIOUS

PDF

95.1 KB Created: 2015-06-10 12:09:32 -06:00 Authoring application: Microsoft® Word 2013

MD5: cc1cc83dab81964069d6e8c1daa37480 SHA-1: acbae24c4182b861596ae0e31f3df6d3f78e308c SHA-256: 641bb48ddbd792bb0c877498c00444c295db594c68ab6fdf74c49870baf48886

558 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that triggers a launch action, executing cmd.exe. This command is designed to execute a payload disguised as 'Proyecto Inyección Malware.pdf'. The embedded executable payload and the use of cmd.exe indicate a malicious intent to deliver and execute a secondary stage. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 14

Adobe Reader Launch action command execution critical CVE exact CVE_2010_1240

PDF 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.
Launch action critical PDF_LAUNCH

PDF contains a /Launch action whose target is an executable, URL, or UNC path — can start an external application
Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOAD

PDF 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.
/Launch action target: cmd.exe critical PDF_LAUNCH_COMMAND

PDF /Launch action specifies an executable target with parameters '/Q /C %HOMEDRIVE%&cd %HOMEPATH%&(if exist "Desktop\\Proyecto Inyección Malware.pdf" (cd "Desktop"' — references a known-dangerous executable (cmd, PowerShell, etc.).
Embedded attachment masquerades: declared document, content is windows-executable critical PDF_EMBEDDED_FILESPEC_CONTENT_MISMATCH

An /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.
ClamAV: Pdf.Tool.Agent-1388586 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Tool.Agent-1388586
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV 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.
/Launch action paired with attachment-dropping JS API high PDF_LAUNCH_PLUS_DROPPER_JS

PDF 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.
Clickable PDF combines external action with parser-evasion structure high PDF_ACTION_PARSER_EVASION

PDF has an external clickable URI together with object graph or xref structures that make parsers disagree, such as divergent duplicate objects, parser divergence, or xref offset mismatch. That combination is stronger than a plain link: the document is both an outward-action carrier and a parser-confusion/evasion sample.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
External URI info PDF_URI

PDF contains an external URL action
Embedded URL info EMBEDDED_URL

One 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 https://intrusionlabs.org/tutoriales/code-cave-inyeccion-de-codigo-pe/
- http://www.zeustech.net/
- http://]hostname[:port]/path
- https://www.virustotal.com/es/
- https://www.offensive-security.com/metasploit-unleashed/vbscript-infection-methods/
- http://tipstrickshack.blogspot.com/2013/10/get-shell-using-shellcode-in-macro.html
- http://www.apache.org/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`Proyecto_Inyeccion_Malware.pdf` `7d838237c4351dd5f23deaabf142dc09e5967f2467e9bced4c97d210a8153e6b`	pdf-embedded-file	PDF EmbeddedFile object 207 at offset 0xCA4E	73802 bytes
Detection ClamAV: Win.Trojan.MSShellcode-7 Obfuscation or payload: unlikely
`javascript_obj0208_000.js` `0bc94b0b60a516af0d644422a68269fc6597e820c512cbe787bcaa8908eb2393`	pdf-javascript-stream	PDF /JS object 208 at offset 0x17639	76 bytes

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