Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a63b562777bfb09…

MALICIOUS

PDF

123.1 KB Created: 2010-03-18 16:39:11 +04:00 Authoring application: PrimoPDF http://www.primopdf.com (via Nitro PDF PrimoPDF)
MD5: 8ac6ba5ad3285d0d0bca227c9d86c86a SHA-1: 17348a45a98a1e9696faacac4910939c1bb8d341 SHA-256: 7a63b562777bfb094d4a72c34e8fc7799cd43d23773735e42900f500ed47fc38
484 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.001 PowerShell T1204.001 User Execution: Malicious Link T1059.003 Windows Command Shell

The PDF file contains embedded JavaScript that triggers a launch action, specifically targeting cmd.exe. This action is designed to execute an embedded Windows executable payload, which is disguised as a PDF file named 'catalogo.pdf'. The ClamAV detection and the critical heuristics for PDF launch actions and embedded PE payloads strongly indicate a malicious intent to deliver and execute malware. The embedded URL is likely related to the tool used to create the PDF.

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\\catalogo.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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
catalogo.pdf
d0a688adb9ae048f6b56e864eb712b2f21b3b4b5760201cba420307d3fe169b5		 pdf-embedded-file PDF EmbeddedFile object 54 at offset 0x1D320 10240 bytes
Detection
ClamAV: Win.Trojan.Small-3960
Obfuscation or payload: unlikely
javascript_obj0055_000.js
b41761703435ad3d4c93eae5dd47f47ce368f519ca0d792b48fc4d6b3122c90a		 pdf-javascript-stream PDF /JS object 55 at offset 0x1E798 57 bytes
stream_007_off00013abd.bin
ee8442cb4a0713786081e40ef1d0f4b7bb981b397fb7c5e84159ea205168c6cc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13ABD 37748 bytes
font_00_sfnt_off00011107.bin
644444183b4cf9af9ea413a00e5fe47bf6eb12d0bc5503b49f2cde74f14b6835		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11107 13904 bytes
font_01_sfnt_off000123ff.bin
3704e011326f5c17811369327645119f389a8c37d34fc0cea8ae5d235240fc16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123FF 15228 bytes
font_03_sfnt_off000181f0.bin
c6a7886a3c717df3c9d2e595ecaa3203a35a7b75cb1da5f6aa28f97c330f3670		 pdf-font-stream PDF embedded font (sfnt) at offset 0x181F0 29844 bytes
font_04_sfnt_off0001b668.bin
87da220756a9d1d60d25b77325d446c8ecd992168f60a5a78b863f7ff9220d15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B668 15640 bytes

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