PDF malware analysis — malicious · 914485564643b61b

MALICIOUS

PDF

11.9 KB

MD5: f8eb452d613c4c815ba57c17067cab8a SHA-1: fe15cce3e4633b1f5bda2d296831e2954f39e379 SHA-256: 914485564643b61b6f73721ebc5c6996d65bfe807f932b218bd02967be48877d

186 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript, triggered by the CVE-2007-5659 exploit targeting the `Collab.collectEmailInfo` function. The heuristics indicate this JavaScript acts as a stager, likely decoding and executing further malicious code. The presence of multiple deobfuscated JavaScript files suggests a complex, multi-stage attack designed to evade detection. The primary goal appears to be the execution of arbitrary code, typical of a downloader or initial access exploit.

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` `a0c8046e83cfc49d773ac6adc533870d558e78346f2c466c7213db680fdb3805`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5036 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` `2b595aed0e43d1255aca445a242a0714f0f2cafdb77778b7199ea13499fd42b0`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	11991 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` `1b296bf3fa858439651a64cc501694e912e6f4efedf2884536390af4432f9c7b`	deobfuscated-js	PDF JavaScript deobfuscation pass	76875 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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