PDF malware analysis — malicious · 1b13557ac3ef5250

MALICIOUS

PDF

11.4 KB

MD5: ea96aace9b2a89349fbb53f44ef8e4e8 SHA-1: e88d382f162bf303b064198f44d7e8a89862b12d SHA-256: 1b13557ac3ef5250b7c51091b9dee9672a618ad8409ae16138578bc9589cfeb3

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/URL

The PDF file contains embedded JavaScript, specifically identified as a hex-encoded stager exploiting CVE-2007-5659 via the Collab.collectEmailInfo function. This JavaScript is responsible for decoding and executing further malicious code. The presence of this exploit and the ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage 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` `4d73770d7c445cafcd3b7d8244d299f8c58666ad642421b413f9dd8d8f89364f`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	5042 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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