PDF malware analysis — malicious · 51d2c387fa27c478

MALICIOUS

PDF

12.1 KB

MD5: e58069604dedfe0337d900fdd4505b4d SHA-1: a2e1446097b440311e6ab9bff9c5a023bcb0bb2e SHA-256: 51d2c387fa27c47836379830c87057db71aee78578c839a7e67292839a4ec0a1

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, specifically leveraging the CVE-2007-5659 vulnerability through the 'collab.collectEmailInfo' method. This JavaScript is heavily obfuscated and staged, with multiple deobfuscated scripts recovered. The primary function appears to be the execution of a malicious payload, indicated by the 'Agent-36063' ClamAV detection and the presence of complex JavaScript stagers. The attack pattern is consistent with exploiting PDF reader vulnerabilities to deliver secondary-stage malware.

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` `f1ba4712a2a4a6a7c18bf2e7a3ad70b633f6ee12bdb36edf1ac235b2eddfa02c`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5130 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` `3123a6753239e15b1d7b6d15a560d0d5535fd473968f8a7fb8afc9b18f7758ae`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12338 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` `3a9002dc340192f7ee2ce5f48945b283a6241f74e5a03913ffd94f5d05727f66`	deobfuscated-js	PDF JavaScript deobfuscation pass	74350 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.