PDF malware analysis — malicious · d7848937cedbbae0

MALICIOUS

PDF

11.9 KB

MD5: f3d26b9e8fa44eac7c4445ff3b8d5952 SHA-1: 6221b9b82c7f7a56a8d8d8790882618a7321a421 SHA-256: d7848937cedbbae0cb30392833c99ed5a8cab6fa2ed9e23a1220c3742f4bc2bb

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Script Execution T1204.001 Malicious Link/URL: Malicious File T1059.007 JavaScript/Script Execution

The PDF file contains multiple embedded JavaScript streams, with a critical heuristic identifying the use of CVE-2007-5659 via the `Collab.collectEmailInfo` method. This indicates the PDF is designed to exploit a vulnerability to execute arbitrary code. The extracted JavaScript files, particularly `annotation_subject_callee_hex_stage_000.js`, are heavily obfuscated but appear to be a stager responsible for decoding and executing further malicious payloads. 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` `ef16454e95701ea89270c6a0a4c76289b5d4a20cba9bb8714bfdbfc70c85cdc5`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5053 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` `0e60675eee21d91d47ac4ceaa6be64a5f9127ad0277c4db4f998a39468de28ad`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	11987 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` `1367190a6d5c9252111770eac18fd09032b960c69b4f3b210413fda53b0dbb65`	deobfuscated-js	PDF JavaScript deobfuscation pass	72720 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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