PDF malware analysis — malicious · 27aacbcb25e2a4d1

MALICIOUS

PDF

11.6 KB

MD5: dc1bcae41efec2be7102363f5f7d8413 SHA-1: 183fa6a125bcc77fd43b0062baae0b2ce78d332a SHA-256: 27aacbcb25e2a4d1772b291cb451e61ef30e1a64aacde97d2bd2b9410c2e901b

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, which is triggered by the 'Collab.collectEmailInfo' method, indicating an exploit for CVE-2007-5659. The JavaScript is heavily obfuscated using String.fromCharCode and concatenation, but the core functionality appears to be the execution of malicious code. This is further supported by ClamAV detecting it as Pdf.Exploit.Agent-36079. The primary attack vector is the exploitation of a PDF reader vulnerability to achieve arbitrary code execution.

Heuristics 6

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-36079 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36079
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `ef8bdac794684ae9cd4eb7091d80e1c5ca478c06c639d72d01626c1f7ce78b6d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19C	578 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `798a080afdf5ee31da8e8263f3c228f5d03d1abc1631186003868ce43c7409b1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	12128 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `18988eb3dbf228a40859be1936ac7f78970e0aa195cf26291f89d0762d8a87ad`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x36F	4999 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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