PDF malware analysis — malicious · 5719142b4bfc4ae2

MALICIOUS

PDF

11.8 KB

MD5: aa8dab36dfa56f3adad56e6e73306de0 SHA-1: c9c2fbec23a6de65cde697da57093281a9c01891 SHA-256: 5719142b4bfc4ae26a0de245f9c194278df5d5dc00a343c94520ab06f7bdf758

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, identified as a stager for CVE-2007-5659. This exploit targets the Collab.collectEmailInfo function, which is used to decode and execute JavaScript. The embedded JavaScript is heavily obfuscated and likely downloads and executes a second-stage payload. ClamAV also detected this file as Pdf.Exploit.Agent-36180.

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-36180 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36180
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.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `17e11d5c0e7abf0d400044cf4333a75f193b35e2745d65fea155eb4de3ce3aa6`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	628 bytes
`annotation_subject_callee_hex_stage_000.js` `c4630f5b7e671adf5055b04c54e6b28be938139524ea70d4e918c920f515a4c8`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5135 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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