PDF malware analysis — malicious · f6be5f26e6892b35

MALICIOUS

PDF

36.5 KB Created: 2010-03-01 08:22:08 -03:00 Authoring application: Writer (via OpenOffice.org 3.1)

MD5: 9b591e2c152eb05356f2de5e562a31c8 SHA-1: ca7344edf623752e990134f40bc6dd164285fca6 SHA-256: f6be5f26e6892b355302baded80e634745ca300bdfd8e08ee074d9be6467e194

484 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.003 Windows Command Shell T1566.002 Spearphishing Attachment T1187 Exploitation for Client Execution

This PDF file contains a JavaScript action that triggers a launch action, exploiting CVE-2010-1240 to execute cmd.exe. The executed command attempts to change the directory and potentially interact with a file named 'teste.pdf' located on the desktop. Furthermore, an embedded PE payload, also masquerading as 'teste.pdf', was detected by ClamAV as Win.Trojan.Rozena-131, indicating it's a malicious executable.

Heuristics 11

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\\teste.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.
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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`teste.pdf` `310051ec1fe51373f25c25f33ea88ef44dba09fdbae9e3eb6ff3ce62605f6f9b`	pdf-embedded-file	PDF EmbeddedFile object 17 at offset 0x4180	37888 bytes
Detection ClamAV: Win.Trojan.Rozena-131 Obfuscation or payload: unlikely
`javascript_obj0018_000.js` `52212058b3bf4a94069e8fd5b07a00a0ba0b6f6d7a10aa614bf6cdd7c3dba282`	pdf-javascript-stream	PDF /JS object 18 at offset 0x8E3B	54 bytes

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