PDF malware analysis — malicious · 3d66844a5945d102

MALICIOUS

PDF

11.9 KB

MD5: ca5ccf7e3fdb490d2d3c80db03a701cc SHA-1: fbe6c0e6bedca3ae77a7d0ba601244d2a004fe70 SHA-256: 3d66844a5945d102612f0d76ae0b954b7631edb36065d209a173265ead93bd58

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, specifically identified as a stager for CVE-2007-5659. This exploit targets the Collab.collectEmailInfo function within Adobe Reader. The embedded JavaScript is heavily obfuscated but is designed to be decoded and evaluated, leading to the execution of malicious code. The primary intent appears to be exploiting a known PDF vulnerability to deliver a secondary payload.

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` `fa525859f8d99e3ff2b183d7652196d95b234613091613f2fade02bd39076889`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5093 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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