Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3d558fdcfdc0fd…

MALICIOUS

PDF

11.7 KB
MD5: 1b79d3c0c8822ad08a8b0b82ff86fc4a SHA-1: 737cfcd6863a339055a9bc04471d1ceba90d3ab2 SHA-256: 5b3d558fdcfdc0fdc9e6c87311aaf719555ce939aa3fbc34743ab773643eaf06
290 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that exploits CVE-2007-5659, specifically targeting Adobe Reader versions within a certain patch range. The script decodes a hex-encoded stager and then uses the 'collab.collectEmailInfo' method to download a payload from the URL http://theyahoo.net/tre/LENA.php/yH499eeda9V07f00420002Rc05bb865102Tbbe92d47Q000002c9901801F0016000aJ05000601l0409. This indicates a clear intent to download and execute a secondary malicious component.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 9

  • Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659
    PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
  • Adobe Reader APSB08-13 patch-range version gate (CVE-2007-5659) high CVE likely PDF_JS_ADOBE_APSB08_13_PATCH_GATE
    PDF JavaScript gates the exploit payload on (>= 8 && < 8.1.1) OR (< 7.1) — the Reader 7.0.x / 8.0–8.1.1 window patched by Adobe APSB08-13 for the CVE-2007-5659 Collab.collectEmailInfo buffer overflow. Only kits that target that exact bug check both of those patch points; benign scripts do not.
  • ClamAV: Pdf.Exploit.Agent-36165 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36165
  • Annotation subject callee-key hex JavaScript stager high PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER
    PDF JavaScript uses syncAnnotScan()/getAnnots() to read an indirect annotation /Subject stream, percent-decodes it through marker replacement, then uses a callee.toString()-derived key to decode and eval the final exploit stage.
  • PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL
    Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
  • 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.
  • 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.
  • 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://theyahoo.net/tre/LENA.php/yH499eeda9V07f00420002Rc05bb865102Tbbe92d47Q000002c9901801F0016000aJ05000601l0409

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
3f254d15363cfc46f758dc79a2cb1074c4072b68aa3f4c80a9bf6696d85176e0		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A6 1045 bytes
annotation_subject_callee_hex_stage_000.js
9e65ada486e3bc5f37d7ab896f99508eb1a1fe8ad21bed2b54f8a031d99083f3		 deobfuscated-js annotation-subject callee-key decoded JavaScript at offset 0x14F 5053 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 5 eval/decoder/string-building token(s).

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