Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2858e6759802e1a…

MALICIOUS

PDF

6.8 KB First seen: 2026-05-10
MD5: 822068614ffb94ccfc7106a23ffbb0e5 SHA-1: 63dce37607d8f6b6476ef1b2036c082edb7c2ce9 SHA-256: a2858e6759802e1abf45edc395900006979853001370e9562e1f7f7288bd0fb2
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is obfuscated, as evidenced by the PDF_UNESCAPE firing and the 'Script obfuscation indicators' static triage finding. The primary purpose appears to be exploiting PDF vulnerabilities, likely to download and execute a secondary payload. The benign URLs present do not indicate malicious intent.

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
    var RandomVar1 = 'ARG0c0cARG0c0c'.replace(/ARG/g,'%u');var RandomVar2 = 'ARG9090ARG9090'.replace(/ARG/g,'%u');var RandomVar3 = 'ARG54EBARG758BARG8B3CARG3574ARG0378ARG56F5ARG768BARG0320ARG33F5ARG49C9ARGAD41ARGDB33ARG0F36ARG14BEARG3828ARG74F2ARGC108ARG0DCBARGDA03ARGEB40ARG3BEFARG75DFARG5EE7ARG5E8BARG0324ARG66DDARG0C8BARG8B4BARG1C5EARGDD03ARG048BARG038BARGC3C5ARG7275ARG6D6CARG6E6FARG642EARG6C6CARG4300ARG5C3AARG2E55ARG7865ARG0065ARGC033ARG0364ARG3040ARG0C78ARG408BARG8B0CARG1C70ARG8BADARG0840ARG09EBA …
  • 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_off00000327.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327 1445 bytes
SHA-256: ab60651643cca67ce2ef97bf43029176cb6d6dc400bdc47c06ba604e01d63bc4
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).
stream_003_off00000708.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x708 442 bytes
SHA-256: fc86124f00c6548be65c15c5b805b77463b08f9178795efdb52958dbe4c58fb7

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