Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b5a4a99f4a4120…

MALICIOUS

PDF

45.5 KB
MD5: 65e432beda66a9b186eaad39137abb03 SHA-1: e779563644d3c4914c5fa2fa6220a37a6e825916 SHA-256: f8b5a4a99f4a4120908f93e1d9e3f3589aa00431074306c9810a429aa69ab33c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript and triggers a critical heuristic for the Adobe Reader CoolType SING font exploit (CVE-2010-2883). The embedded JavaScript, particularly the decompressed stream, is likely responsible for downloading and executing a secondary payload. The presence of multiple JavaScript streams and XFA form elements further supports the exploitation of PDF vulnerabilities to deliver malicious content.

Heuristics 9

  • Adobe Reader CoolType SING font exploit — CVE-2010-2883 critical CVE likely CVE_2010_2883
    PDF embeds a TrueType/OpenType font with an actual SING table and pairs it with JavaScript heap-spray shellcode. This matches the public Adobe Reader CoolType SING exploit shape for CVE-2010-2883.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Additional-actions dictionary low PDF_AA
    PDF defines /AA (Additional Actions) that references an executable action (JS/JavaScript/Launch/SubmitForm) — can auto-trigger on document or widget events. Form-field calc/format/validate/keystroke handlers in legitimate interactive forms commonly fire this, so it is reported as a low-weight signal; weaponised auto-execution is flagged by stronger rules (PDF_OPENACTION, encrypted-with-JS, etc.)
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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.

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0001_000.js
214dac5e9132d49bbc84d069de3223873f6e360fc8998d37fe6fffe33992482d		 pdf-javascript-stream PDF /JS object 1 at offset 0xA 2342 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
javascript_obj0006_001.js
a915a83bbac265d19518ec5b296d16166c8ea1973c6073e84a2e1e970c5e5971		 pdf-javascript-stream PDF /JS object 6 at offset 0xCDB 37 bytes
stream_002_off0000acc6.js
d1dfd457a2fdd3cec4091f689f39b85b35666aa5599ef3a8d5f9a80d1e2ce105		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xACC6 1042 bytes
font_00_sfnt_off00000f0f.bin
0aeec6326db779ed0ba79865b089db2643cbaf2be42eb091a61a07d3beab89e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F 65932 bytes
font_01_type1_off0000b16a.bin
c6bf78478c9c4dd5b3b86554d34c78f847f70af4118f9ff083c1fccf0e8e932b		 pdf-font-stream PDF embedded font (type1) at offset 0xB16A 97 bytes
font_02_type1_off0000b3f3.bin
b749644b3e758e7335900ab2e7499eaa64b3a946849f1f8a0948287bdd96763d		 pdf-font-stream PDF embedded font (type1) at offset 0xB3F3 144 bytes

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