PDF malware analysis — malicious · e684f3c076cd533e

MALICIOUS

PDF

12.0 KB

MD5: f2f6ea4525306eceb904f861a18702ba SHA-1: 91546f959b0c44e675e759ab1f7afb692f3eaa51 SHA-256: e684f3c076cd533e6a4f9c990527b7a8137d8e99400fd671ab6390535aa0d57e

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Scripting T1204.002 Malicious Link/URL

The PDF file contains embedded JavaScript that is obfuscated and designed to be executed as a stager. The critical heuristic 'CVE_2007_5659: Collab.collectEmailInfo' indicates the exploitation of a known PDF vulnerability to achieve code execution. The extracted JavaScript artifacts, particularly 'annotation_subject_callee_hex_stage_000.js', are likely responsible for decoding and executing a further stage of the attack, potentially downloading additional malware or establishing persistence. 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` `7a12f2a87b256cd15a032a6d5a7e24e99abe6dfc8c8b39deaa99bedc7756cfe6`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5110 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` `56294ed7fb161eb62c28cffdb707ca364929a8a6e7ff8da972b6907b94ad95bf`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12105 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` `73383e76f14b0649aaa10729c2d5ab76aad34f49a87479092952e2b7ef61c20a`	deobfuscated-js	PDF JavaScript deobfuscation pass	71920 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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