PDF malware analysis — malicious · e8698a16fcc6bd24

MALICIOUS

PDF

9.6 KB

MD5: 0b5caf7005aedf7368e5da68a1715c7b SHA-1: feb1eecee311708378b230f822fec73c9998739b SHA-256: e8698a16fcc6bd24bbb1efbf02bf22c436a4efcca59f3a2e7f8ae3252f7a196f

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains a critical heuristic indicating the exploitation of CVE-2007-5659 using a JavaScript stager. This stager is embedded within an annotation's subject field and is designed to decode and execute malicious JavaScript. The deobfuscated JavaScript, totaling over 46KB, likely downloads and executes a second-stage payload, which is a common technique for initial access and further system compromise. The presence of multiple JavaScript streams and the specific exploit technique strongly suggest a malicious intent, though the exact family cannot be determined from the provided evidence.

Heuristics 6

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)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `b9a85ee399db318b3ad68d0755effe289a645a7404fad2094712c8a3fd042920`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	244 bytes
`annotation_subject_callee_hex_stage_000.js` `802df8906b3755bdf20ad89df120056832f0e4fe56321878464c2cf69221f674`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5224 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `e5721353bcb901b37272108afc68ee81c6d4d131fa3aa92032c024ccc8aecf91`	deobfuscated-js	PDF JavaScript deobfuscation pass	46422 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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