Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b7ba4462d93c82…

MALICIOUS

PDF

45.6 KB
MD5: 5b6648c8f593627a4eba9591725f7481 SHA-1: 254a7866edec752713bfe447a58b1136cc08d0c8 SHA-256: 35b7ba4462d93c82ba136e8e7c94ccf6aee4e9f13326d7fea6ff3f135fa1d4a8
222 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell

The critical heuristic firing for CVE-2010-2883 indicates exploitation of a known Adobe Reader vulnerability. The presence of embedded JavaScript, specifically the 'unescape()' call and a decompressed script payload, strongly suggests the PDF is designed to download and execute a secondary stage. The ClamAV detection 'Pdf.Dropper.Agent-7248367-0' further confirms its malicious nature as a dropper. No specific family could be identified, but the attack pattern is consistent with a drive-by download or exploit-laced document.

Heuristics 10

  • 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-7248367-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7248367-0
  • 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
  • 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
76f7d5e9412ea556a76d3beccd7bf4291b3f57f0d2b36a531387092e7e37000a		 pdf-javascript-stream PDF /JS object 1 at offset 0xA 2408 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 0xD1D 37 bytes
stream_002_off0000ad07.js
d1dfd457a2fdd3cec4091f689f39b85b35666aa5599ef3a8d5f9a80d1e2ce105		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAD07 1042 bytes
font_00_sfnt_off00000f51.bin
8f4816ca89fd4944f42c5d9bfa0c40c6f99accf7007c7485d7c7b14adea2d26a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF51 65932 bytes
font_01_type1_off0000b1ab.bin
c6bf78478c9c4dd5b3b86554d34c78f847f70af4118f9ff083c1fccf0e8e932b		 pdf-font-stream PDF embedded font (type1) at offset 0xB1AB 97 bytes
font_02_type1_off0000b434.bin
b749644b3e758e7335900ab2e7499eaa64b3a946849f1f8a0948287bdd96763d		 pdf-font-stream PDF embedded font (type1) at offset 0xB434 144 bytes

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