PDF malware analysis — malicious · e3dd61141a47e16d

MALICIOUS

PDF

12.1 KB

MD5: 3d79615cddb02d3d67075acd9983f085 SHA-1: 1674dc8057b77ae1200c321437a31ac958c39df8 SHA-256: e3dd61141a47e16dac1e37dbe33bb2e73b3022ccd8c0b0f95b0eac4bec801541

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains embedded JavaScript, specifically identified as a stager using a hex decoder. The critical heuristic CVE_2007_5659 indicates the exploitation of the Collab.collectEmailInfo method, a known vulnerability in older PDF readers. This JavaScript is designed to execute a secondary payload, likely downloaded from a remote source, which is a common technique for delivering malware. The presence of obfuscated JavaScript and the specific exploit technique strongly suggest malicious intent.

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-36181 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36181
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` `a246c68d5544a5fc390ae92571a910dee0516c54ba546b2460fd1ca6ec360799`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1A6	604 bytes
`annotation_subject_callee_hex_stage_000.js` `0065a7bb549c1ec098cbf2344039f9d935352c45338a9111203e8d70d8447a03`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5318 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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