Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b0c298b3e36a9d…

MALICIOUS

PDF

8.1 KB First seen: 2013-02-18
MD5: fedfc5002ce56bfa85aaecaeb203a79c SHA-1: e7f98d6c3b2800b9df43a6f1b8685a2f25b3b924 SHA-256: 50b0c298b3e36a9d6d0307d3f72b8472e286540f6431c526212383387ccc9ee8
158 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 presence of a PDF_EVAL heuristic firing suggests that the JavaScript is being used to execute arbitrary code, likely to download and run a second-stage payload. The PDF_FROMCHARCODE heuristic further points to obfuscation techniques commonly used in malicious scripts. No specific family could be identified, and no external URLs were found to be malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9224

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_002_off00000328.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x328 3006 bytes
SHA-256: a444650cd329bba97768be3dcc7006a88f9db48bb819aac6c5d339eeebbfa592
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
objstm_0024_00.bin pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 380 bytes
SHA-256: b9a4f94994591fe6023ea78e487d378767ea4322565a24fe312b9c0d230729a0

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