PDF malware analysis — malicious · 755eb2b4eb7c2c55

MALICIOUS

PDF

12.0 KB

MD5: bb2061fd2f5bb89e26a93b77502416c3 SHA-1: eae5039738236a52d54a796960d05d88c0f19a9d SHA-256: 755eb2b4eb7c2c550c5147ca0fb006db61378543b51b0a997bf3bfb65c8576f9

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell T1204.002 Malicious Link/URL T1055.001 Process Injection

The PDF file contains embedded JavaScript, specifically leveraging the CVE-2007-5659 vulnerability through the `collab.collectEmailInfo` function. This JavaScript is heavily obfuscated and appears to be a stager, as indicated by the heuristic `PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER` and the presence of multiple deobfuscated JavaScript files. The primary function of this script is to download and execute a second-stage payload, although the exact URL or execution method is not directly extractable from the provided evidence. The ClamAV detection `Pdf.Exploit.Agent-36063` further confirms its malicious nature.

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` `77dc4e2382656d68c7140cb745963dc09df3013e5b81d6af8ad45c4fb838a2e1`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5086 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` `26f48484b0277e551c1236f000a4fce318d4c4ca95acb82c7f630da890ce66ce`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	11998 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` `2f1ca7fb2b5d9793544a38dcf409651375300dbe5e8ebebe57ae5471cfdb5100`	deobfuscated-js	PDF JavaScript deobfuscation pass	72256 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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