PDF malware analysis — malicious · 3a1e7e19cd22969e

MALICIOUS

PDF

9.3 KB

MD5: 0e5f9bfa30a1b08da08df00d3f5036bc SHA-1: 73c82c6ded73fb482cdee8eff301b896be8f200d SHA-256: 3a1e7e19cd22969efda5d8497f3ad4ae3eb30e3c1b258863ca909d8672e3689e

266 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious Link

The PDF file contains embedded JavaScript that is heavily obfuscated using `unescape()` and `eval()` calls. The critical `CVE_2007_5659` heuristic indicates the exploitation of a known PDF vulnerability via the `Collab.collectEmailInfo` method, which is used to stage and execute the JavaScript payload. The script's primary function appears to be decoding and executing a second-stage payload, as evidenced by the large size of the deobfuscated JavaScript files and the presence of multiple JavaScript streams. The attack pattern is consistent with a PDF-based exploit designed to deliver a malicious payload.

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` `2a011779ef5efbcd7b1dfb0bc118cee7390a64c57764fa55199d88afe82d6ee6`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5066 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` `7fc80911b173649d832544d2bb9442bf8c523233b28670fe82d938ac97a5bda9`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2B5	11915 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` `62184f26840e8239323ce9995af9958e8b53bacf28908625c1005681509d8e84`	deobfuscated-js	PDF JavaScript deobfuscation pass	74341 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).

Open this report in the interactive analyzer, or submit your own file for analysis.