PDF malware analysis — malicious · 27ad665ec73a4c4b

MALICIOUS

PDF

12.0 KB

MD5: a8361b22b845b3e32a6362fc7d065c32 SHA-1: 944e33b052dc18835775504fff557413a6c5e444 SHA-256: 27ad665ec73a4c4bfee578f330658182383c09d53162d21b23c3e2c740a4d6bc

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Script Execution T1204.002 Malicious Link/URL: Malicious File

The PDF file contains embedded JavaScript that is obfuscated and designed to be executed. The critical heuristic CVE_2007_5659 indicates exploitation of a known PDF vulnerability (Collab.collectEmailInfo) to launch this JavaScript stager. The stager is responsible for decoding and executing a secondary payload, as evidenced by the deobfuscated JavaScript stream. The file is detected by ClamAV as Pdf.Exploit.Agent-36165, confirming its malicious nature.

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.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `3f254d15363cfc46f758dc79a2cb1074c4072b68aa3f4c80a9bf6696d85176e0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	1045 bytes
`annotation_subject_callee_hex_stage_000.js` `ff600ac97f580ea4e3fcd4571e70d358f873d65c9cf5b9c13ef208377ac8500d`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5119 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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