Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd01ad06c87c6e0…

MALICIOUS

PDF

11.8 KB
MD5: fa40feab9d7becf5709657c4949cb9ba SHA-1: ec0a1f5ab5321564bcc397c845edce5fd2c13e7b SHA-256: 1dd01ad06c87c6e0e7f7834b76d2b81a02debf7de15fbdc3f8bc83cda7450d93
178 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, specifically identified as a 'hex stager' exploiting CVE-2007-5659 via the Collab.collectEmailInfo method. This JavaScript is deobfuscated and appears to be designed to download and execute a second-stage payload. The ClamAV detection further confirms its malicious nature. The primary IOC is the deobfuscated JavaScript file.

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-36179 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36179
  • 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
e89d7054d228dd0d7d4de9a02d1607a443ba297f326673115b5825c1b6cb184a		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A6 823 bytes
annotation_subject_callee_hex_stage_000.js
7ed4e62214b59ee5a48f6372639a6c0963c1de4778da739c9d159c5299ec7b50		 deobfuscated-js annotation-subject callee-key decoded JavaScript at offset 0x14F 5012 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 5 eval/decoder/string-building token(s).

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