PDF malware analysis — malicious · c1c0f6d70afb3bbe

MALICIOUS

PDF

3.1 KB

MD5: fc9c5312ca9b5878814e51a3a664eb3c SHA-1: 8ba3a25658f90ce1a598336156b53195dcbc25cd SHA-256: c1c0f6d70afb3bbe5d4a2a50309aca551dd3886921537b73bd04f5efb5015131

384 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious File T1059 Command and Scripting Interpreter T1059.003 Command and Scripting Interpreter: Windows Command Shell T1105 Ingress Tool Transfer T1105 Ingress Tool Transfer

The PDF file contains embedded JavaScript and a PE payload, triggered by a launch action that executes cmd.exe. This chain of execution is designed to download and run a secondary malicious payload, as indicated by the critical heuristics for PDF launch actions and embedded PE executables. The ClamAV detections further confirm the malicious nature of both the PDF and the extracted executable.

Heuristics 9

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\\template.pdf" (cd "Desktop"' — references a known-dangerous executable (cmd, PowerShell, etc.).
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.
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
`javascript_obj0009_000.js` `bc1d5cdfa608238e3cd965aa51949d02f8ab713463ea0beb61ec928b121788d1`	pdf-javascript-stream	PDF /JS object 9 at offset 0x762	57 bytes
`stream_001_off000003b1.bin` `974105890bdda3cf08198d2c41e00e6cc9d1cc9394984f16216b657cf26d9cf1`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3B1	7168 bytes
Detection ClamAV: Win.Trojan.MSF_Shellcode-1 Obfuscation or payload: unlikely

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