PDF malware analysis — malicious · 55d19ecac033f92c

MALICIOUS

PDF

12.2 KB

MD5: 1a8b46df88a5b3091135f940f00cdaa9 SHA-1: f8c318da927cd92ee305e3f7bdd5a63b8079bea0 SHA-256: 55d19ecac033f92c61e07cb26754d31e6898903b4f4f76bfe079f51ccf9469a8

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File T1071.001 Web Protocols

The PDF file contains embedded JavaScript, identified by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. Critical heuristics like CVE_2007_5659 and PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER indicate the use of a JavaScript stager exploiting a known PDF vulnerability (CVE-2007-5659) via the `collab.collectEmailInfo` method. This stager is designed to decode and execute further JavaScript, likely to download and run a second-stage payload. The presence of large deobfuscated JavaScript files further supports this.

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 3

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` `6053b238af184c7096300a03f176660f69ac9a42d9cabf041a3010cbbfac9425`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5227 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `cfa7b6955982388fb25f7a82faff192a8df1123d8f9d2ba0f77aa405247d7e72`	deobfuscated-js	PDF JavaScript deobfuscation pass	70763 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.