Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6ff053aece3746…

MALICIOUS

PDF

12.2 KB
MD5: e5395a08d1e391b3950aa02cf530cb84 SHA-1: e3dee64764cfa6d352c2e2e75a53edb02fce46b3 SHA-256: 4f6ff053aece3746ea647d90e8e827b8baabf2a5f5790bb4d1b658404cffe3ad
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability via the `collab.collectEmailInfo` function. This JavaScript acts as a stager, decoding and executing a larger, obfuscated JavaScript payload. The primary intent appears to be the execution of this secondary payload, likely to download and run further malicious content.

Heuristics 6

  • 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)
  • 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.
  • 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.

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
c88186c1a62748fb1305b3f682bc2606ba4b701bdc80ad300abcc6bb949f7162		 deobfuscated-js annotation-subject callee-key decoded JavaScript at offset 0x14F 5195 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 5 eval/decoder/string-building token(s).

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