PDF malware analysis — malicious · 7b4fbdd3d39df305

MALICIOUS

PDF

248.9 KB Created: 2016-11-01 16:22:03 +02:00 Authoring application: Microsoft® Word 2013

MD5: b1356870eed0928769d933fc206012ae SHA-1: fab209774b684df39edb0cdaa35aa96f9d6b384a SHA-256: 7b4fbdd3d39df30588e253ad08cc68a8a61ea74fd5fd28880db6b629e644d7e5

328 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

This PDF file contains embedded JavaScript and a PE payload, and is configured with a launch action that executes cmd.exe. The critical heuristic CVE_2010_1240 indicates that this is likely an attempt to exploit a known vulnerability to execute arbitrary code. The embedded executable payload is the primary malicious artifact, and the PDF's launch action facilitates its execution. ClamAV identified the file as Pdf.Tool.Agent-1388586.

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\\CV.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
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
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser exited 1. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0613_000.js` `f07671e1d1a5354a83247f13ee48f530abd2c0e02dc54886cee5d9e59029c7d0`	pdf-javascript-stream	PDF /JS object 613 at offset 0x3DDDA	51 bytes
`stream_019_off0003318d.bin` `7e7338391ef10d16c75132cdf2f4c25c42333d08049570efd633d96ffa83e5d2`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3318D	73802 bytes

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