Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1414cdaf75a370…

MALICIOUS

PDF

146.7 KB
MD5: a69cbb709208c237386e2b9932924d40 SHA-1: d96a94f095c4f2411f7bfef86d4148b70318e3ef SHA-256: 0f1414cdaf75a3703110e6368c07b6c053c7c16ef9b89f713bc62d60a2d776dd
76 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript that utilizes the syncAnnotScan function and retrieves annotation names and subjects. This JavaScript is likely intended to exploit a vulnerability within the PDF viewer to download and execute a secondary payload. The ML classifier strongly indicated maliciousness, and the presence of JavaScript actions and streams supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9153

Heuristics 5

  • 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.
  • syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN
    PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed stream)
  • 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://www.iec.ch

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0017_000.js
65e6cc05a19eb53c2156c3d9f65721f01f3c6472dfb42e9210850a28d9f6f257		 pdf-javascript-stream PDF /JS object 17 at offset 0x35C 120 bytes
deobfuscated.js
af5501d4bbd589b23970ff2070969be65583a6053be3b02db3fbe6dbb5f0c7d2		 deobfuscated-js PDF JavaScript deobfuscation pass 908785 bytes
font_00_cff_off000049a7.bin
38cd02761c6da2a2c7c5d41cbb937f7d5a9b2ac0aa4a2a519b84785c2d82e7c2		 pdf-font-stream PDF embedded font (cff) at offset 0x49A7 4095 bytes

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