PDF malware analysis — malicious · 1fb05432e359feba

MALICIOUS

PDF

12.2 KB

MD5: c804005b086eacc57e99c95cb67fa670 SHA-1: 03098e9d7dcafe43940ae486cf2b1beeba3b8f54 SHA-256: 1fb05432e359feba564e2a16c8b9b5be5b719280cad0de6c850082778e9a62f0

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious JavaScript T1059.007 JavaScript/JScript

The PDF file contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability related to the `Collab.collectEmailInfo` function. The heuristics indicate a JavaScript stager that decodes and executes further stages. The presence of multiple deobfuscated JavaScript files suggests a complex execution chain designed to deliver a malicious payload.

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` `f0e53f10381ae938232c8f32b0540d9720af25ee8355ab4cbf2337e56a8f8ddb`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5259 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` `f61682761e34c58d9d4f9127a28aba24c2879bc35717af33a5c2422a0cefacd1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12422 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` `558fc0726e3dac6bcef25fcaed9780d8c35dc09f95aefe8564caa2b9ad0380aa`	deobfuscated-js	PDF JavaScript deobfuscation pass	80866 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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