Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99cab946a79d24c…

MALICIOUS

PDF

45.5 KB
MD5: c3a4ebdf4e70bebca7ebc85fecd73be5 SHA-1: afe6ad03604ee4f9904d248f53d2801f271809fe SHA-256: c99cab946a79d24cf8c63e90862a26f9fa1d83e30ab5a896f477a3022b4dce80
244 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.001 Malicious Link T1566.001 Spearphishing Attachment T1204 User Execution

The PDF file contains embedded JavaScript and triggers a critical vulnerability (CVE-2010-2883) in Adobe Reader. The embedded JavaScript, likely obfuscated, is designed to download and execute a secondary payload. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a dropper or exploit loader.

Machine Learning

  • Nyx Malicious PDF Classifier malicious score 0.9996

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.
  • ClamAV: Pdf.Dropper.Agent-7303362-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7303362-0
  • 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
  • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0001_000.js
31536236bc4157f24c917f37f8da56fdb30865c2fb04f79c647f9563249a06f7		 pdf-javascript-stream PDF /JS object 1 at offset 0xA 2388 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
stream_002_off0000ac94.js
d1dfd457a2fdd3cec4091f689f39b85b35666aa5599ef3a8d5f9a80d1e2ce105		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAC94 1042 bytes
font_00_sfnt_off00000ed8.bin
c7b9849cd72f3debe57f230c0abefc8d3d72889d158decee0b5875d36fcbdada		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED8 65932 bytes
font_01_type1_off0000b138.bin
c6bf78478c9c4dd5b3b86554d34c78f847f70af4118f9ff083c1fccf0e8e932b		 pdf-font-stream PDF embedded font (type1) at offset 0xB138 97 bytes
font_02_type1_off0000b3c1.bin
b749644b3e758e7335900ab2e7499eaa64b3a946849f1f8a0948287bdd96763d		 pdf-font-stream PDF embedded font (type1) at offset 0xB3C1 144 bytes

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