Malicious PDF — malware analysis report

Static analysis result for SHA-256 022c95c236d9fbc0…

MALICIOUS

PDF

58.9 KB
MD5: bb9e8ead0afc0dabc74b8c59b6b5df1e SHA-1: 45128a5ea6a3e617fc09f8e0f564e55e8527748c SHA-256: 022c95c236d9fbc06c2e2ac7dee73e95d3e0bce97822fafe31c4dc5b757bd403
218 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript that utilizes eval() and ASCIIHexDecode, indicating an attempt to obfuscate and execute malicious code. This cluster of heuristics strongly suggests exploitation for client execution. The presence of an embedded file further supports the theory that this PDF acts as a dropper for a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 9

  • 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.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (matched inside decoded stream)
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/AcrobatAdhocWorkflow/1.0/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0003.bin
f0156a5c9cfac0444d237fb92b5b9731faaa34f807b3d583c1b88283feefed46		 pdf-embedded-file PDF EmbeddedFile object 3 at offset 0xA4A 26804 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.
objstm_0019_00.bin
3c1f535c3444b771730612e0d6ccc904c2294c53cb3061b9964d54deb01e68be		 pdf-objstm-decoded PDF /ObjStm 19 0 obj (inflated) 1313 bytes

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