PDF malware analysis — malicious · 7f93bad93e6e21a1

MALICIOUS

PDF

26.3 KB Created: 2010-05-18 00:45:49 -03:00 Authoring application: PrimoPDF http://www.primopdf.com (via Nitro PDF PrimoPDF)

MD5: a4a3eaa3bc4d6e1fcb7bc386f2846d9d SHA-1: 7926b84c1bbc22f4a1cc6ce3f94942e2da11def7 SHA-256: 7f93bad93e6e21a13343b161b32ad3d030718e2c17c2954b2abfd8aee8c8b618

484 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information T1140 Deobfuscate/Decode Files or Information

The PDF file contains embedded JavaScript that leverages a launch action to execute cmd.exe. This action is designed to exploit CVE-2010-1240, a known vulnerability in Adobe Reader. The primary payload is an embedded Windows executable, disguised as 'corrupteddata.pdf', which was detected by ClamAV as Win.Trojan.Rozena. The embedded executable is likely a second-stage downloader or dropper.

Heuristics 12

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\\corrupteddata.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
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.
/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
`corrupteddata.pdf` `c9550e244d96063c9aed88060aba51ca9b2f9784a5ba4928c0a209a4f9e80ef7`	pdf-embedded-file	PDF EmbeddedFile object 18 at offset 0x1827	37888 bytes
Detection ClamAV: Win.Trojan.Rozena-24 Obfuscation or payload: unlikely
`javascript_obj0019_000.js` `3f0bad9d72ae01d539c888b14c6fc2d71da5a5f2ef1a8ae806c8ee2347569a2b`	pdf-javascript-stream	PDF /JS object 19 at offset 0x6509	62 bytes
`font_00_sfnt_off000006ba.bin` `f923d0be2241783bc0af543e68632b118efae9ba31bfba4f67d9fb9f2dd668f0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6BA	6372 bytes

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