PDF malware analysis — malicious · 8d3176e3463808a6

MALICIOUS

PDF

12.2 KB

MD5: 9eb35dddb5707f1febea42dc6a5adfce SHA-1: 5f7882018b58147bcf4137b4df4168a5050ce44e SHA-256: 8d3176e3463808a69e1b5ec90f87d554ddfa7b9cd6dabd990de2dedfc8f9be1e

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File: User Execution: Malicious PDF

The PDF file contains multiple embedded JavaScript streams, including a significant one identified as a hex stager. The critical heuristic CVE_2007_5659 indicates the exploitation of a known PDF vulnerability (Collab.collectEmailInfo) to decode and execute this JavaScript. The JavaScript is responsible for downloading and executing a second-stage payload, as evidenced by the presence of multiple deobfuscated JavaScript files and the ClamAV detection signature 'Pdf.Exploit.Agent-36063'.

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` `f32477e6e235a1d972653e3233175fa4407996dd51e55bfa8d377a03f0dafdb1`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5241 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` `aefd13c9a20952d1a5771ad2304972041d0fd709e2b9a8de3987a6b4c5026537`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12478 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` `060651940b247156b8ac5fcd8c173ae539f491fdede60dc79dfbf3147f04527e`	deobfuscated-js	PDF JavaScript deobfuscation pass	75537 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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