PDF malware analysis — malicious · 8eb8f880cdc405b5

MALICIOUS

PDF

9.3 KB

MD5: 7f0a8aced5c7cb00724b5e09af5eddda SHA-1: 3df5883a5d74c09cc3a560bf0a0ea278405d1abc SHA-256: 8eb8f880cdc405b5cc2a23a0a521129b4a8eb21b08afe07190ab06fab02463d7

266 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious Link T1071.001 Web Protocols

The PDF file contains multiple critical heuristic firings indicating JavaScript execution and exploitation of CVE-2007-5659 (Collab.collectEmailInfo). The embedded JavaScript is heavily obfuscated but uses eval() and unescape() functions, typical for stagers. The primary intent appears to be the execution of a malicious script that likely downloads and executes a secondary payload, as suggested by the ClamAV detection name 'Pdf.Exploit.Agent-35912'. No specific URLs or network indicators were directly extracted, but the exploit mechanism is clear.

Heuristics 9

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-35912 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35912
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
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` `7218a1c68060953321573daa035b16f5f32928ce25a9eb656690dbe78cd9464e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	201 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`annotation_subject_callee_hex_stage_000.js` `04ac039d06ddd84a289749696c275b9ff89275b7482266a03016b8827f541208`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5184 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` `13357f6e68eb116661293dc38ecf56edc13d30bc4753cbffb46cfaa740c54e48`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2B5	12034 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `b22495653a67ff34770fd4c2c90860563cf5eb18b44729c478280c6c25e413d6`	deobfuscated-js	PDF JavaScript deobfuscation pass	42200 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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