Malicious PDF — malware analysis report

Static analysis result for SHA-256 956eb5df41719820…

MALICIOUS

PDF

6.4 KB First seen: 2026-05-11
MD5: d4e76a66800fe56ebf17c829d196e506 SHA-1: af0cbeef99d3de2cb360248a50791306a347d907 SHA-256: 956eb5df4171982017087a96ec7c10c0e140d4b06c62b99ea7a29dc334c147b3
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF document contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream utilizes an unescape() function, suggesting obfuscation. While no specific malicious URLs or scripts were directly extracted, the presence of obfuscated JavaScript within a PDF is a strong indicator of an attempt to deliver a malicious payload, likely through a spearphishing attachment. The extracted artifact names are included as potential IOCs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
    RandomVar1=unescape(RandomVar1);
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000325.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x325 786 bytes
SHA-256: 7790f2e997aec1d3989c923489dfaef75c48d360f4a1ab0f8029a350a6f401e9
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).
objstm_0024_00.bin pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes
SHA-256: abc0013c46a097607c9084c7e022f000cc84a75f9e68c745fb8512b213b6b93c

Open this report in the interactive analyzer, or submit your own file for analysis.