PDF malware analysis — malicious · eccd53903c9aa79f

MALICIOUS

PDF

35.3 KB Created: 2009-08-30 00:20:17 UTC Authoring application: AdobePS5.dll Version 5.2.2 (via Mac OS X 10.5.8 Quartz PDFContext)

MD5: d0ede10b1980203c4a448164172e2e40 SHA-1: 3784c3d557d511d79ee2376b3077472054685b93 SHA-256: eccd53903c9aa79feddbc6b7534368f581f56fe0a24c3c7f7cb5119702c00860

484 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF document contains embedded JavaScript that leverages a launch action to execute cmd.exe. The critical heuristic 'CVE_2010_1240' indicates this is a known exploit for Adobe Reader. The embedded file 'form.pdf' is detected as a Windows executable by ClamAV, and the 'PDF_LAUNCH_COMMAND' heuristic shows it attempts to execute 'cmd.exe' with specific parameters. The overall intent appears to be downloading and executing a second-stage payload disguised as a PDF.

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 (if exist "%HOMEPATH%\\My Documents\\form.pdf" (cd "%HOMEPATH%\\My Documents"' — 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`form.pdf` `4e5a5b1fc3a9884b04fd6d1b12159cbef9512397af9a73f51457213399cbb823`	pdf-embedded-file	PDF EmbeddedFile object 21 at offset 0x3B9E	37888 bytes
Detection ClamAV: Win.Trojan.ShellcodeReverseTcp-1 Obfuscation or payload: unlikely
`javascript_obj0022_000.js` `eff4a0943aaff2d99cb5c8666337775c91d4d5f687782df94d2c5fc77becde7f`	pdf-javascript-stream	PDF /JS object 22 at offset 0x8940	53 bytes
`icc_00_off000002d6.icc` `2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e`	pdf-icc-profile	PDF ICC profile at offset 0x2D6	3144 bytes

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