Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb1c20114ccd7e1…

MALICIOUS

PDF

1.00 MB
MD5: 616fc2a26b83b0b866449648b2608d11 SHA-1: 855691cd33224313609432dee1772339253c83af SHA-256: 4bb1c20114ccd7e1a1cb8fdf7b2fd0d865642298edc8b3346caf77ec7cf02e76
138 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript with high-confidence heuristic firings for eval() calls and embedded script payloads. The script is obfuscated but appears to be designed to download and execute a second-stage payload from the URL http://www.fyedit.cn/maindll/. The presence of JavaScript actions and embedded scripts points to a malicious PDF designed for payload delivery.

Heuristics 7

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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 https://bonus.s7
    • http://schemas.xmlsoap.o��
    • http://lqotX-.dns-stu@H
    • http://luizsilva-001-site@
    • http://www.fyedit.cn/maindll/
    • http://certs.ox
    • https://apis.google
    • http://www.w3.org/2001/XMLScher�
    • http://www.w3.org/2003/05/�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_00086a26.bin
b6c773957ac10235f1c2dbbc84fe26a6269a76c48491e29ede5d998455a624b0		 pdf-embedded-script PDF decompressed stream script payload at offset 0x86A26 1048476 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 5 shell/COM execution token(s). Carved artifact contains 4 eval/decoder/string-building token(s).

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