PDF malware analysis — malicious · 4a40723cc4348db8

MALICIOUS

PDF

28.2 KB Created: 2010-04-15 08:32:24 +08:00 Authoring application: WPS Office 个人版 (via PDFlib 7.0.3 (C++/Win32))

MD5: bfabd71a25080355230f222ec5decf9f SHA-1: 2a84c2ab0f02972e95effade05c76d84fb30f42e SHA-256: 4a40723cc4348db84f0592c5fc9d481253f8fd87cdf1bb010583b9c6e0c9b963

424 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer T1566.002 Spearphishing Attachment

The PDF file contains embedded JavaScript and a launch action that targets cmd.exe, indicating an attempt to execute arbitrary commands. The critical heuristic PDF_EMBEDDED_PE_PAYLOAD confirms an embedded Windows executable payload, and PDF_LAUNCH_PLUS_DROPPER_JS suggests this executable is intended to be dropped and run. The embedded attachment is named 'decrypted.pdf' but is identified as a Windows executable, further supporting the malicious intent.

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\\decrypted.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
/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
`decrypted.pdf` `288a312807e2838f8df6ef41107ca9dfc7a8efcd3290b6db72a7fce4d01ca0ef`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x51B	65536 bytes
`javascript_obj0014_000.js` `a984dcc830ca98cebd6637ff3893626ff078f3bed622f43cb142f4921b3b9240`	pdf-javascript-stream	PDF /JS object 14 at offset 0x6CD5	58 bytes

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