Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0bb56f61d9031d…

MALICIOUS

PDF

7.1 KB First seen: 2026-05-11
MD5: ca9659bd796340b733821208bb69fdfb SHA-1: e860c5d7b09f6f901c1f33a67b5d6664369c5882 SHA-256: ac0bb56f61d9031d73375dd575168e00f15fe9fe90c126d436dc0220a1f502ec
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream, located at offset 0x82B, utilizes an unescape() function, suggesting obfuscation and potential malicious intent. This pattern is commonly used to download and execute further payloads. The file's structure and the presence of obfuscated JavaScript point towards an exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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_off00000327.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327 2338 bytes
SHA-256: 64b880b8c3ebcc1c6b5c32b5aac6fa3ec781a5e82e710174eeb691e38f37650d
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_off0000082b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x82B 442 bytes
SHA-256: e20d3a80456beed9cbee11bf10ddf8dccfda9b54e8a53b98ed8607053ccf2586

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