PDF malware analysis — malicious · 2607bc1ea7f8a702

MALICIOUS

PDF

12.1 KB

MD5: beb494d080ed8bfda7e53ecece43ccaf SHA-1: bdc30f81f3a76f25b0481b1d2508e27f6ed320bc SHA-256: 2607bc1ea7f8a70259750913648fba7c113e0b6c01d879f14f3bf78edbb4b167

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript that is heavily obfuscated. Heuristics indicate the use of CVE-2007-5659 (Collab.collectEmailInfo) to stage and execute this JavaScript. The script is designed to download and execute a second-stage payload, as evidenced by the 'annotation_subject_callee_hex_stager' and 'Pdf.Exploit.Agent-36063' detections. The primary attack vector is the exploitation of a PDF reader vulnerability.

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` `acd78824a4c068d873c47072e5c9372e53062c10f9ad5d8f37035732b1a793ce`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5150 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` `82ff1359319c8c0b983425d7b9317ebe5776351fa291b5a5a86d9c81c051f26f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12323 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` `e6b786c49899a3b60db5f5e08cf16446e24cd0f23e5c3c096b4eb70b0db6d623`	deobfuscated-js	PDF JavaScript deobfuscation pass	84384 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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