PDF malware analysis — malicious · 42a7d36542d52535

MALICIOUS

PDF

11.5 KB

MD5: 8490f12ebaebd81401e0bd4f37b16200 SHA-1: da7762cb16d6f76ec4d937b50bfcceb9d2404077 SHA-256: 42a7d36542d5253561e657caa723bcd367b1b395b305b4a7f01fe9379d56c56e

178 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, identified as a stager for CVE-2007-5659. The heuristic firings indicate that the file exploits a known vulnerability (Collab.collectEmailInfo) to execute obfuscated JavaScript. This script is likely responsible for downloading and executing a secondary payload, as suggested by the 'Agent' component in the ClamAV detection name. The document body was unreadable, but the exploit and script content strongly suggest a 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-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` `e7c07ad5bf7e0722c1fee8e6722bf8fce898706dc1e6ad532dab6bf3e8a92b88`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14F	4899 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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