PDF malware analysis — malicious · db4e12839b144138

MALICIOUS

PDF

9.4 KB

MD5: 9eb2066e7e333eb2df2364c5d03c21ed SHA-1: 31e62ed6ca4ac6a577e1c941bdb18a40aa869c28 SHA-256: db4e12839b1441382c37ac91c8851357d06c894ff2de25c1cf3608c2e0f980f2

266 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious File T1059.001 Command and Scripting Interpreter: JavaScript T1140 Deobfuscate/Decode Files or Information

The PDF file contains embedded JavaScript that utilizes the `unescape()` and `eval()` functions, indicating a deobfuscation and execution routine. The critical heuristic `CVE_2007_5659` specifically points to the exploitation of a known vulnerability in Adobe Reader via the `Collab.collectEmailInfo` method. This suggests the primary attack vector is leveraging this exploit to run the embedded script, which likely downloads and executes a second-stage payload. No specific family could be identified, but the exploit and JavaScript execution are clear indicators of malicious intent.

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` `3163b50842adf40658ca7d196adb63a27ac11dda60cdf9b641e165fb4a57ea4c`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5031 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` `506ef37f7818f627af868a46f3061fc5472df8ab01886c8441e60a96ed533316`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2B5	11874 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` `ee9d66d3886a3c203d6bbac5384ae66e70d8b0ff9d9cfa45eb0d0a603e1c3654`	deobfuscated-js	PDF JavaScript deobfuscation pass	43445 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.