PDF malware analysis — malicious · f8c7e7983cf31aaa

MALICIOUS

PDF

60.3 KB Created: 2010-03-20 09:22:51 +00:00 Authoring application: PrimoPDF http://www.primopdf.com (via Nitro PDF PrimoPDF)

MD5: cc71c8f6901267d0840fe2639c87312d SHA-1: 53b0c178cab3e9cbfd10b7da813c15ed7c5a556f SHA-256: f8c7e7983cf31aaa6a406dcd3857268b7a7dfb995cc477d2b0128dfbfc089230

424 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript and a launch action that targets cmd.exe, indicating an attempt to execute arbitrary commands. It also embeds a Windows executable disguised as a PDF file named 'testpdf.pdf'. This combination strongly suggests a malicious payload delivery mechanism, likely exploiting CVE-2010-1240 to achieve code execution and drop the embedded PE file.

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\\testpdf.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
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://www.primopdf.com

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`testpdf.pdf` `bdb3430b055299861bceb5991174a8a42b098939cd9439f05ccadc07a36015f9`	pdf-embedded-file	PDF EmbeddedFile object 17 at offset 0x2E2C	107560 bytes
`javascript_obj0018_000.js` `b0a59e347f4a1f2e28e54ea9ecc6e7e447a9522dcec90a0d12471dd5fe5b28cd`	pdf-javascript-stream	PDF /JS object 18 at offset 0xEDA2	56 bytes
`font_00_sfnt_off000004ce.bin` `162bec52abd01d487f9b6ad46ff8600e6e712ee6c9d6ce05003d99fd27e70e76`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4CE	17328 bytes

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