Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c4a971738b0eca…

MALICIOUS

PDF

8.1 KB First seen: 2013-03-20
MD5: bbc46f90358c731458a4378dbb3f592c SHA-1: e050a58b680019fb7d4b18f2c3c133d28b0137d6 SHA-256: e4c4a971738b0eca16f250ca5fe64de1c30c373a197883d862dbd5710a2a7d81
128 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The eval() call and String.fromCharCode usage suggest obfuscated code execution. While no specific URLs or network indicators were extracted, the presence of eval() and JavaScript within a PDF strongly suggests an attempt to download and execute a secondary payload or exploit a vulnerability. The obfuscation makes it difficult to determine the exact intent without further dynamic analysis.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3812

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
    eval(o);
  • 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://d2F.QK/_-a Referenced by PDF JavaScript
    • 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
🗂 Part of campaign: d2f.qk 21 samples

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00000650.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x650 3002 bytes
SHA-256: 6c0612e7fcc655de6cd18b8b8c7c104f000b6ebf7a6f89d61cf9fc57bb9377e8
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
objstm_0023_00.bin pdf-objstm-decoded PDF /ObjStm 23 0 obj (inflated) 325 bytes
SHA-256: 45bc3e1858552e1ed83b6a9a130d10d2ec3239fa8675900b570f071943f5f8d2

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