Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea309205bee716a…

MALICIOUS

PDF

2.20 MB Created: 2010-02-28 18:06:55 Authoring application: Microsoft® Office PowerPoint® 2007
MD5: f4aa8879069bc2d9cec10d86da3cd400 SHA-1: 9a96e002718c8efcde4a9266692397bc4a673768 SHA-256: 6ea309205bee716a504e20f07ef955dfa85b799dae8ed3aa3088274062778e79
498 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains JavaScript that triggers a launch action, executing cmd.exe with parameters designed to download and execute an embedded file named '1.pdf'. This embedded file is detected as a Windows executable by ClamAV, indicating it's likely a second-stage payload. The ML classifier and ClamAV detections further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 13

  • 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
  • /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\\1.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.
  • Clickable PDF combines external action with parser-evasion structure high PDF_ACTION_PARSER_EVASION
    PDF has an external clickable URI together with object graph or xref structures that make parsers disagree, such as divergent duplicate objects, parser divergence, or xref offset mismatch. That combination is stronger than a plain link: the document is both an outward-action carrier and a parser-confusion/evasion sample.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.iana.org/assignments/port-numbers

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
1.pdf
7a501b1c422366ae36d7ba53f52ec3f05c30c7c747d6c63f4e5e091d8af0c439		 pdf-embedded-file PDF EmbeddedFile object 2454 at offset 0x22E792 37888 bytes
Detection
ClamAV: Win.Trojan.Rozena-131
Obfuscation or payload: unlikely
javascript_obj2455_000.js
6a59dd3b366f3db80f454a191b81fd87c67c56e15006b58e6d6da19c8de4eb77		 pdf-javascript-stream PDF /JS object 2455 at offset 0x2334FA 50 bytes
stream_075_off000e8c36.bin
cf3d013868d81b5a4ece490e9baaa54bc521d1b94cb1a5674178d639a4d7c163		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE8C36 2724864 bytes

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