PDF malware analysis — malicious · cf6447e88bf82af0

MALICIOUS

PDF

9.3 KB

MD5: 8c069124646adb187221ca33c7780a98 SHA-1: 9a2670012039b3f655231e43ecfed00a675baa1a SHA-256: cf6447e88bf82af0b065d797c61eb0945c2f960e3c92c80f5d2fb111827cdf68

266 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious Link/URL T1059.003 Windows Command Shell

This PDF file contains embedded JavaScript that is heavily obfuscated using `unescape()` and `eval()` calls, a common technique for delivering malicious payloads. The critical heuristic `CVE_2007_5659` indicates the exploitation of a known PDF vulnerability via the `collab.collectEmailInfo` method, which is used to stage and execute the JavaScript. The script's primary function appears to be downloading and executing a second-stage payload, as suggested by the presence of multiple deobfuscated JavaScript files and the overall structure of the exploit chain. The confidence is high due to the critical heuristic firings and the clear exploitation pattern.

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` `b5e7c57e8afc4f01b9b5d222bf45983196a5d88fb3301ddc076acaf2eadd16c2`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5045 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` `042cead8251f7e3e0d2ac938a3e773a11112dee004ecade6fed23f72af0097a4`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2B5	11905 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` `846b6d5dd23291dafbfeca4f35785ef6d2411a2a715daa72bdeb9d71ffdf5c18`	deobfuscated-js	PDF JavaScript deobfuscation pass	42754 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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