PDF malware analysis — malicious · 88d46d58b3dff220

MALICIOUS

PDF

11.7 KB

MD5: cafbdbf8a4a939fc5fac056b8894cf74 SHA-1: cca92122fc3dd8f5248f7f4f408c1a4af09a4fa7 SHA-256: 88d46d58b3dff2208fd7b3cf09ef6cfe8f0119dcc956830ff17f2ff3ad58a6ef

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF document contains embedded JavaScript that is obfuscated and then decoded using a hex decoder. This script is designed to exploit CVE-2007-5659, leveraging the 'Collab.collectEmailInfo' method to stage and execute a malicious payload. The presence of multiple deobfuscated JavaScript files indicates a multi-stage attack designed to evade detection. The primary attack vector appears to be the exploitation of a known PDF vulnerability.

Heuristics 7

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-36063 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36063
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed stream)
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `eb39e2de4dbbc100de6d3e30aa43ff78fa075618862ba1ebba5151ea3a3b848d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	273 bytes
`annotation_subject_callee_hex_stage_000.js` `defab3e179f13b186363fcbaa4e75048d0b22881d95366b184175a693b92ffcf`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	4980 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `29bc45174a12fe14855b0ef2c5ed9d6d0004e3e66411ad6859d10af56a889d71`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	11787 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `6d9acd1e240b95f3a4701cb83447c37f1df336d776f9b78ef4f213ef1aa37698`	deobfuscated-js	PDF JavaScript deobfuscation pass	71896 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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