Malicious PDF — malware analysis report

Static analysis result for SHA-256 36db8ab920fb1b3f…

MALICIOUS

PDF

45.8 KB
MD5: 04cd5ae8009be2f0a7ba5756bc187589 SHA-1: ac5a78d5b52ab20dd143e18006eee53d3ac21be0 SHA-256: 36db8ab920fb1b3fcf07235c0c1109f862a5bea952f0d15a5f1537c86821b1d5
214 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File Execution: Malicious File T1059.001 Command and Scripting Interpreter: PowerShell T1566.001 Phishing: Spearphishing Attachment

The critical heuristic firing for CVE-2010-2883 indicates exploitation of a known Adobe Reader vulnerability. The presence of embedded JavaScript, specifically unescaped JavaScript streams and a JavaScript object, strongly suggests that the exploit is used to execute malicious code. The ClamAV detection name 'Pdf.Dropper.Agent-7248938-0' further confirms its malicious nature as a dropper. The embedded JavaScript likely acts as a downloader for a secondary payload.

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-7248938-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7248938-0
  • 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
adfbbbe02f916634f2b5345e2f5169a11ce80d3a4fcd984d013991bd743713e0		 pdf-javascript-stream PDF /JS object 1 at offset 0xA 2775 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
stream_002_off0000ae0f.js
d1dfd457a2fdd3cec4091f689f39b85b35666aa5599ef3a8d5f9a80d1e2ce105		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAE0F 1042 bytes
font_00_sfnt_off0000105a.bin
7efaaeff3ea21ffa798e9e2c34aee852812edfde85fe21a3a69a972baf9933af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105A 65932 bytes
font_01_type1_off0000b2b3.bin
c6bf78478c9c4dd5b3b86554d34c78f847f70af4118f9ff083c1fccf0e8e932b		 pdf-font-stream PDF embedded font (type1) at offset 0xB2B3 97 bytes
font_02_type1_off0000b53c.bin
b749644b3e758e7335900ab2e7499eaa64b3a946849f1f8a0948287bdd96763d		 pdf-font-stream PDF embedded font (type1) at offset 0xB53C 144 bytes

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