Malicious PDF — malware analysis report

Static analysis result for SHA-256 738350afa43ee28d…

MALICIOUS

PDF

20.6 KB
MD5: 1d51f32f12931aa7b10fd74b2355d366 SHA-1: f247a1d98c7660f87dc4fef609fd154fd2da9a9e SHA-256: 738350afa43ee28d482e5ba808265d38857c8571bcc4bb306113499046ace220
120 Risk Score

Malware Insights

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

This PDF sample contains embedded JavaScript that is heavily obfuscated using String.fromCharCode and hexadecimal encoding. The ML classifier and PDF JavaScript exploit cluster heuristics strongly indicate malicious intent. The script's purpose is to download and execute a second-stage payload, as suggested by the obfuscated string which likely decodes to a URL or executable path.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • 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 paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • Suspicious extracted artifact info 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.
  • 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.w3.org/1999/02/22-rdf-syntax-ns# In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0099_000.js
f4d5b25b373088df8af07415d7137effed292f6b75aa172400f12d34fbe47b8f		 pdf-javascript-stream PDF /JS object 99 at offset 0x479A 19820 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
if(!this.scroll())gg="\x65";
zz=function(){return "\x76\x61\x6c";};
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... (truncated)

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