PDF malware analysis — malicious · 23760711157a7aee

MALICIOUS

PDF

27.9 KB Created: 2010-05-02 22:00:06 +02:00 Authoring application: Writer (via OpenOffice.org 3.2)

MD5: 8120596d02f0ec743a17fe95bd1ed08d SHA-1: 83c150f5589f51aee532b0dd845a7894d3a2b897 SHA-256: 23760711157a7aeea5815ffa8d522a70a391303e05179f60dff78adf80f1b4da

484 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.003 Windows Command Shell

The PDF file contains embedded JavaScript and a PE payload, which is a common technique for delivering malware. The critical heuristic PDF_LAUNCH_COMMAND indicates that cmd.exe is launched with parameters that suggest an attempt to execute a dropped file. The embedded artifact 'fil.pdf' is identified as a Windows executable by ClamAV, and the overall file is detected as 'Pdf.Tool.Agent-1388586' and 'Win.Trojan.Rozena-131', confirming its malicious nature. The CVE_2010_1240 heuristic further points to a known exploit for command execution.

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\\fil.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
`fil.pdf` `b7862322ac2042dc077900afb57986ce2d63e46809aeae93a220727d383fea35`	pdf-embedded-file	PDF EmbeddedFile object 17 at offset 0x1E8A	37888 bytes
Detection ClamAV: Win.Trojan.Rozena-131 Obfuscation or payload: unlikely
`javascript_obj0018_000.js` `86f37607614965d910520880daa0271842a3edc846e69673aee12920f9fe69ca`	pdf-javascript-stream	PDF /JS object 18 at offset 0x6BD1	52 bytes

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