PDF malware analysis — malicious · 38381d0d55e51b9b

MALICIOUS

PDF

225.8 KB Created: ÅÄ½{ìxôbë¶x¦àä Authoring application: Ñì9µ<°`ôÞëQ÷£ÍÆ]s (via Àý$¾-°uÓôIÀ"þ´ÌRßM$eæ%k)

MD5: 572cf76676cb5ce7267d94fda8272dad SHA-1: b0104a38da34c8eedaa921b1f170b9e54d709183 SHA-256: 38381d0d55e51b9b155d3113699b0c027b07bb38649eccdcb44f862b29cfe0a6

368 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204 User Execution

The PDF file contains embedded JavaScript and a launch action that targets cmd.exe, indicating an attempt to exploit CVE-2010-1240 for arbitrary code execution. The embedded PE payload and the use of cmd.exe with parameters like '/Q /C %HOMEDRIVE%&cd %HOMEPATH%&(if exist "Desktop\sozluk.pdf" (cd "Desktop"' strongly suggest the document is designed to download and execute a secondary malicious payload. The ClamAV detection further confirms its malicious nature.

Heuristics 10

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\\sozluk.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
Encrypted PDF carries /JavaScript — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS

PDF declares /Encrypt and also references an executable trigger (/JavaScript). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
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_obj0110_000.js` `9b8fa365d442bfacfed2046967c9bcf544ff4dadfdebfbfbc53e24bdd6d5a918`	pdf-javascript-stream	PDF /JS object 110 at offset 0x38009	55 bytes
`stream_000_off00033225.bin` `ee0e817687a0d9e82a5e4baea631f1e5f2135da9f0bb5be60aec60dc2b637fa7`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x33225	37888 bytes

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