PDF malware analysis — malicious · b4b5ecfa4dc67125

MALICIOUS

PDF

12.0 KB

MD5: dbbe3b8be25a7727f02488afc86e8a85 SHA-1: 9400e5d05eaac5621cebdcd63c9fbd505a104027 SHA-256: b4b5ecfa4dc67125f9b573e99bdcb0537f417fbfb3130e4c9f9cc1f61f7841e6

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains a critical heuristic firing for CVE-2007-5659, indicating the exploitation of a vulnerability related to the `collab.collectEmailInfo` function. Embedded JavaScript, recovered through multiple stages including a hex decoder, is used as a stager. This script is responsible for downloading and executing a second-stage payload, as evidenced by the deobfuscated JavaScript artifacts. The ClamAV detection further confirms the malicious nature of the file.

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` `2abbdd1c59f68d719aca9a7ea4a220eb0472e06ccc5896e0413602aafdb005ed`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5127 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` `b125a53ec33bd0952fcbb448fa7de7394251f4ef5523c830f2e772c26cdd2385`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12203 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` `ea2cc02f85022fd69ad9b8c67583b5f947f4b8905232335f85013fbe2772cae1`	deobfuscated-js	PDF JavaScript deobfuscation pass	83752 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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